Authentication Bypass
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
How It Works
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications. Instead of cracking passwords through brute force, attackers manipulate the authentication process itself to gain unauthorized entry. This typically occurs through one of several pathways: exploiting hardcoded credentials embedded in source code or configuration files, manipulating parameters in authentication requests to skip verification steps, or leveraging broken session management that fails to properly validate user identity.
The attack flow often begins with reconnaissance to identify authentication endpoints and their underlying logic. Attackers may probe for default administrative credentials that were never changed, test whether certain URL paths bypass login requirements entirely, or intercept and modify authentication tokens to escalate privileges. In multi-step authentication processes, flaws in state management can allow attackers to complete only partial verification steps while still gaining full access.
More sophisticated variants exploit single sign-on (SSO) or OAuth implementations where misconfigurations in trust relationships allow attackers to forge authentication assertions. Parameter tampering—such as changing a "role=user" field to "role=admin" in a request—can trick poorly designed systems into granting elevated access without proper verification.
Impact
- Complete account takeover — attackers gain full control of user accounts, including administrative accounts, without knowing legitimate credentials
- Unauthorized data access — ability to view, modify, or exfiltrate sensitive information including customer data, financial records, and intellectual property
- System-wide compromise — admin-level access enables installation of backdoors, modification of security controls, and complete infrastructure takeover
- Lateral movement — bypassed authentication provides a foothold for moving deeper into networks and accessing additional systems
- Compliance violations — unauthorized access triggers breach notification requirements and regulatory penalties
Real-World Examples
CrushFTP suffered a critical authentication bypass allowing attackers to access file-sharing functionality without any credentials. The vulnerability enabled direct server-side template injection, leading to remote code execution on affected systems. Attackers actively exploited this in the wild to establish persistent access to enterprise file servers.
Palo Alto's Expedition migration tool contained a flaw permitting attackers to reset administrative credentials without authentication. This allowed complete takeover of the migration environment, potentially exposing network configurations and security policies being transferred between systems.
SolarWinds Web Help Desk (CVE-2024-28987) shipped with hardcoded internal credentials that could not be changed through normal administrative functions. Attackers discovering these credentials gained full administrative access to helpdesk systems containing sensitive organizational information and user data.
Mitigation
- Implement multi-factor authentication (MFA) — requires attackers to compromise additional verification factors beyond bypassed primary authentication
- Eliminate hardcoded credentials — use secure credential management systems and rotate all default credentials during deployment
- Enforce authentication on all endpoints — verify every request requires valid authentication; no "hidden" administrative paths should exist
- Implement proper session management — use cryptographically secure session tokens, validate on server-side, enforce timeout policies
- Apply principle of least privilege — limit damage by ensuring even authenticated users only access necessary resources
- Regular security testing — conduct penetration testing specifically targeting authentication logic and flows
Recent CVEs (32724)
In engineermode service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In telocom service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In telecom service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In telecom service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In telephony service, there is a possible missing permission check. Rated medium severity (CVSS 4.4), this vulnerability is low attack complexity. No vendor patch available.
In telephony service, there is a possible missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In telephony service, there is a possible missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In telephony service, there is a possible missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In IMS service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In omacp service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In omacp service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In omacp service, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In telecom service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In wifi service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In ion service, there is a possible missing permission check. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
In imsservice, there is a possible way to write permission usage records of an app due to a missing permission check. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
Forgejo before 1.20.5-1 allows 2FA bypass when docker login uses Basic Authentication. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Incorrect Authorization vulnerability could allow attackers to bypass authorization checks to access restricted resources.
In Forgejo before 1.20.5-1, certain endpoints do not check whether an object belongs to a repository for which permissions are being checked. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Dell Rugged Control Center, version prior to 4.7, contains an Improper Access Control vulnerability. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
Dell Rugged Control Center, version prior to 4.7, contains an improper access control vulnerability. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
dpaste is an open source pastebin application written in Python using the Django framework. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Cross-Site Scripting (XSS) vulnerability could allow attackers to inject malicious scripts into web pages viewed by other users.
IBM Administration Runtime Expert for i 7.2, 7.3, 7.4, and 7.5 could allow a local user to obtain sensitive information caused by improper authority checks. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.
The password for access to the debugging console of the PoWer Controller chip (PWC) of the MIB3 infotainment is hard-coded in the firmware. Rated medium severity (CVSS 6.8), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
An issue has been discovered in GitLab EE affecting all versions starting from 16.2 before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
An issue has been discovered in GitLab EE affecting all versions starting from 8.13 before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. Rated low severity (CVSS 3.1), this vulnerability is remotely exploitable. No vendor patch available.
An issue has been discovered in GitLab affecting all versions starting from 9.2 before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
An issue has been discovered in GitLab affecting all versions starting from 13.2 before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
An issue has been discovered in GitLab affecting all versions starting from 11.3 before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
An issue has been discovered in GitLab affecting all versions starting from 12.1 before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
Dell Rugged Control Center, version prior to 4.7, contains insufficient protection for the Policy folder. Rated low severity (CVSS 3.3), this vulnerability is low attack complexity. No vendor patch available.
Tyler Technologies Magistrate Court Case Management Plus allows an unauthenticated, remote attacker to upload, delete, and view files by manipulating the PDFViewer.aspx 'filename' parameter. Rated critical severity (CVSS 9.4), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Tyler Technologies Civil and Criminal Electronic Filing allows an unauthenticated, remote attacker to upload, delete, and view files by manipulating the Upload.aspx 'enky' parameter. Rated critical severity (CVSS 9.4), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Tyler Technologies Court Case Management Plus allows a remote, unauthenticated attacker to enumerate directories using the tiffserver/te003.aspx or te004.aspx 'ifolder' parameter. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Tyler Technologies Court Case Management Plus allows a remote, unauthenticated attacker to enumerate and access sensitive files using the tiffserver/tssp.aspx 'FN' and 'PN' parameters. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Tyler Technologies Court Case Management Plus allows a remote attacker to authenticate as any user by manipulating at least the 'CmWebSearchPfp/Login.aspx?xyzldk=' and. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Catalis (previously Icon Software) CMS360 allows a remote, unauthenticated attacker to view sensitive court documents by modifying document and other identifiers in URLs. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
An Improper Authentication vulnerability in the Schweitzer Engineering Laboratories SEL-451 could allow a remote unauthenticated attacker to potentially perform session hijacking attack and bypass. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
An Insufficient Entropy vulnerability in the Schweitzer Engineering Laboratories SEL-451 could allow an unauthenticated remote attacker to brute-force session tokens and bypass authentication. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Missing Authorization vulnerability in WPOmnia KB Support - WordPress Help Desk and Knowledge Base allows Accessing Functionality Not Properly Constrained by ACLs. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
Incorrect Authorization vulnerability in NicheAddons Events Addon for Elementor allows Accessing Functionality Not Properly Constrained by ACLs.1.3. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Before DolphinScheduler version 3.1.0, the login user could delete UDF function in the resource center unauthorized (which almost used in sql task), with unauthorized access vulnerability (IDOR), but. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. This Missing Authorization vulnerability could allow attackers to access resources or perform actions without proper authorization checks.
An improper authentication vulnerability in the authentication module of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 could allow an unauthenticated. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
A low-privileged OS user with access to a Windows host where NETGEAR ProSAFE Network Management System is installed can create arbitrary JSP files in a Tomcat web application directory. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. Public exploit code available and no vendor patch available.
NETGEAR ProSAFE Network Management System has Java Debug Wire Protocol (JDWP) listening on port 11611 and it is remotely accessible by unauthenticated users, allowing attackers to execute arbitrary. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Cosmos provides users the ability self-host a home server by acting as a secure gateway to your application, as well as a server manager. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
A missing permission check in Jenkins NeuVector Vulnerability Scanner Plugin 1.22 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified hostname and port using. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
Missing permission checks in Jenkins MATLAB Plugin 2.11.0 and earlier allow attackers to have Jenkins parse an XML file from the Jenkins controller file system. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Incorrect permission checks in Jenkins Google Compute Engine Plugin 4.550.vb_327fca_3db_11 and earlier allow attackers with global Item/Configure permission (while lacking Item/Configure permission. Rated low severity (CVSS 2.7), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
Zumtobel Netlink CCD Onboard 3.74 - Firmware 3.80 was discovered to contain hardcoded credentials for the Administrator account. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
The FACSChorus software contains sensitive information stored in plaintext. Rated medium severity (CVSS 4.3), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
The Operating System hosting the FACSChorus application is configured to allow transmission of hashed user credentials upon user action without adequately validating the identity of the requested. Rated low severity (CVSS 3.8), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
There is no BIOS password on the FACSChorus workstation. Rated medium severity (CVSS 5.2), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
An authentication bypass vulnerability in the Direct Connection Module in Ezviz CS-C6N-xxx prior to v5.3.x build 20230401, Ezviz CS-CV310-xxx prior to v5.3.x build 20230401, Ezviz CS-C6CN-xxx prior. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Netwrix Usercube before 6.0.215, in certain misconfigured on-premises installations, allows authentication bypass on deployment endpoints, leading to privilege escalation. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A dylib injection vulnerability in XMachOViewer 0.04 allows attackers to compromise integrity. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Under rare conditions, the effective permissions of an object might be incorrectly calculated if the object has a specific configuration of metadata-driven permissions in M-Files Server versions. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
The web interface of the PAC Device allows the device administrator user profile to store malicious scripts in some fields. Rated medium severity (CVSS 4.8), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
The WP Shortcodes Plugin - Shortcodes Ultimate plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 5.13.3 via the su_meta shortcode due to. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.
Quick Facts
- Typical Severity
- CRITICAL
- Category
- auth
- Total CVEs
- 32724