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CWE-287

Improper Authentication

2774 CVEs Avg CVSS 7.6 MITRE
874
CRITICAL
900
HIGH
897
MEDIUM
93
LOW
631
POC
34
KEV

Monthly

CVE-2026-47156 CRITICAL PATCH GHSA Act Now

Privilege escalation to administrator in MantisBT 2.28.3 and earlier lets a low-privileged or self-registered user impersonate any account, including the administrator, through the SOAP API's flawed mci_check_login() function. Because the function accepts any valid cookie_string without checking that it belongs to the supplied username, an attacker who knows a target username (e.g. 'administrator') and possesses their own MANTIS_STRING_COOKIE can authenticate as that user without a password. With self-registration enabled by default ($g_allow_signup = ON), this is exploitable from zero prior access, granting full read/write and destructive control over all projects, issues, and user data. There is no public exploit identified at time of analysis and it is not listed in CISA KEV, but the underlying bug is trivially reliable.

Authentication Bypass PHP
NVD GitHub
CVE-2026-44986 CRITICAL PATCH Act Now

Account takeover in Penpot before 2.14.5 allows an authenticated registered user to hijack any non-blocked profile without knowing its password. The flaw chains three defects: create-team-invitations leaks invitation tokens, prepare-register-profile embeds an existing profile's id into the prepared-register JWE, and register-profile then mints a session on an invitation email match while skipping password verification (CWE-287). No public exploit has been identified, but the fix commit and PR diff are public and the CVSS base score is 9.9.

Authentication Bypass Penpot
NVD GitHub
CVSS 3.1
9.9
CVE-2026-47159 MEDIUM PATCH This Month

Vaultwarden's SSO discovery endpoint exposed real organization SSO metadata - including organizationIdentifier values - to unauthenticated requests for arbitrary email addresses, enabling organization enumeration and authentication workflow abuse. All Vaultwarden deployments prior to 1.36.0 with SSO enabled are affected; an attacker with network access could query the `/organizations/domain/sso/verified` endpoint with any email address to harvest real org names and identifiers, then leverage those identifiers to obtain a valid pre-validation JWT through the `prevalidate()` flow without legitimate credentials. No public exploit code is identified and this vulnerability is not listed in the CISA KEV catalog at time of analysis.

Authentication Bypass Vaultwarden
NVD GitHub
CVSS 4.0
6.9
CVE-2026-61740 CRITICAL PATCH Act Now

Authentication bypass in HKUDS LightRAG before 1.5.4 lets a remote unauthenticated attacker defeat X-API-Key protection when the server runs in the API-key-only profile (LIGHTRAG_API_KEY set, AUTH_ACCOUNTS unset). Because auth.py falls back to a public hardcoded DEFAULT_TOKEN_SECRET and /auth-status and /login freely mint guest JWTs, combined_dependency honored a guest token before ever checking the API key, exposing document read/upload/delete, graph mutation, and query endpoints. No public exploit is identified at time of analysis, but the underlying fix (PR #3319) ships a regression test showing that forging a valid guest token with the default secret is trivial; fixed in 1.5.4.

Authentication Bypass Lightrag
NVD GitHub
CVSS 4.0
9.3
CVE-2026-61436 HIGH PATCH This Week

Webhook signature-verification bypass in PraisonAI before 4.6.78 lets unauthenticated attackers forge Svix 'message.received' events when the framework runs in AgentMail webhook mode. Because incoming payloads are trusted without validating the Svix signature (CWE-287), an attacker can POST crafted JSON to the webhook endpoint and cause configured agents to process attacker-chosen sender addresses and message bodies. A vendor patch exists (4.6.78); there is no public exploit identified at time of analysis and it is not listed in CISA KEV.

Authentication Bypass Praisonai
NVD GitHub
CVSS 4.0
8.8
CVE-2026-61435 HIGH PATCH This Week

Authentication bypass in PraisonAI before 4.6.78 lets a remote, unauthenticated attacker reach the Call API agent-invocation endpoints when the deployment runs with PRAISONAI_CALL_AUTH=disabled. Because the localhost-only safeguard derives the bind host from the client-supplied HTTP Host header, an attacker on the network can send a spoofed 'Host: 127.0.0.1' header to defeat the restriction and both enumerate and invoke registered agents. Vendor patch is available (reported by VulnCheck); no public exploit identified at time of analysis and it is not listed in CISA KEV.

Authentication Bypass Praisonai
NVD GitHub
CVSS 4.0
8.8
CVE-2026-56353 MEDIUM PATCH This Month

Authentication bypass in the n8n Chat Trigger node allows unauthenticated network access to protected webhook endpoints when the node is explicitly configured with n8n User Auth - a non-default operator setting. Affected releases span all 1.x builds before 1.123.22, the entire 2.0.0-2.9.2 range, and 2.10.0. No public exploit code or active exploitation (CISA KEV) has been identified at time of analysis; the CVSS 4.0 score of 6.3 with AT:P correctly reflects that real-world exposure is bounded by the non-default configuration prerequisite.

Authentication Bypass N8n
NVD GitHub
CVSS 4.0
6.3
CVE-2026-12281 HIGH POC PATCH This Week

Authentication bypass in the Shibboleth WordPress plugin before 2.5.4 lets remote unauthenticated attackers forge identity headers and log in when the HTTP header identity mode is enabled without an anti-spoofing key. Because the plugin fails open rather than closed, any request carrying identity headers is trusted as an authenticated session, and with automatic account creation plus the default administrator role mapping an attacker can provision and sign in as a brand-new administrator. Rated CVSS 8.1 (CWE-287); publicly available exploit code exists (WPScan), but it is not listed in CISA KEV.

Authentication Bypass WordPress Shibboleth
NVD WPScan VulDB
CVSS 3.1
8.1
EPSS
0.1%
CVE-2026-5270 CRITICAL Act Now

Authentication bypass in Ciena Navigator Network Control Suite (NCS 8.1), Manage Control Plane (MCP ≤ 8.0), and Blue Planet components (Inventory, Orchestration, Route Optimization & Analysis, Unified Assurance & Analytics, Planner Plus) allows an unauthenticated network attacker to manipulate HTTP request paths and headers to reach protected functionality while also evading audit logging. Rated CVSS 9.8 with a fully remote, low-complexity, no-interaction vector, this flaw hands attackers administrative-level access to carrier-grade network control and orchestration platforms. No public exploit identified at time of analysis and the CVE is not listed in CISA KEV, but the trivial exploitation profile makes it a high-priority patch for affected operators.

Authentication Bypass
NVD VulDB
CVSS 3.1
9.8
EPSS
0.2%
CVE-2026-50365 HIGH PATCH Exploit Unlikely This Week

Elevation of privilege in the Microsoft Windows RPC API lets an unauthenticated attacker on an adjacent network gain higher privileges by exploiting an improper authentication weakness (CWE-287), provided a user is lured into an interaction. The flaw spans a broad range of client and server builds from Windows Server 2012 through Windows Server 2025 and Windows 10 1607 through Windows 11 26H1. No public exploit identified at time of analysis; the issue was reported by Microsoft, which has released a fix.

Authentication Bypass Microsoft Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21H2 +15
NVD
CVSS 3.1
8.0
EPSS
0.5%
CRITICAL PATCH Act Now

Privilege escalation to administrator in MantisBT 2.28.3 and earlier lets a low-privileged or self-registered user impersonate any account, including the administrator, through the SOAP API's flawed mci_check_login() function. Because the function accepts any valid cookie_string without checking that it belongs to the supplied username, an attacker who knows a target username (e.g. 'administrator') and possesses their own MANTIS_STRING_COOKIE can authenticate as that user without a password. With self-registration enabled by default ($g_allow_signup = ON), this is exploitable from zero prior access, granting full read/write and destructive control over all projects, issues, and user data. There is no public exploit identified at time of analysis and it is not listed in CISA KEV, but the underlying bug is trivially reliable.

Authentication Bypass PHP
NVD GitHub
CVSS 9.9
CRITICAL PATCH Act Now

Account takeover in Penpot before 2.14.5 allows an authenticated registered user to hijack any non-blocked profile without knowing its password. The flaw chains three defects: create-team-invitations leaks invitation tokens, prepare-register-profile embeds an existing profile's id into the prepared-register JWE, and register-profile then mints a session on an invitation email match while skipping password verification (CWE-287). No public exploit has been identified, but the fix commit and PR diff are public and the CVSS base score is 9.9.

Authentication Bypass Penpot
NVD GitHub
CVSS 6.9
MEDIUM PATCH This Month

Vaultwarden's SSO discovery endpoint exposed real organization SSO metadata - including organizationIdentifier values - to unauthenticated requests for arbitrary email addresses, enabling organization enumeration and authentication workflow abuse. All Vaultwarden deployments prior to 1.36.0 with SSO enabled are affected; an attacker with network access could query the `/organizations/domain/sso/verified` endpoint with any email address to harvest real org names and identifiers, then leverage those identifiers to obtain a valid pre-validation JWT through the `prevalidate()` flow without legitimate credentials. No public exploit code is identified and this vulnerability is not listed in the CISA KEV catalog at time of analysis.

Authentication Bypass Vaultwarden
NVD GitHub
CVSS 9.3
CRITICAL PATCH Act Now

Authentication bypass in HKUDS LightRAG before 1.5.4 lets a remote unauthenticated attacker defeat X-API-Key protection when the server runs in the API-key-only profile (LIGHTRAG_API_KEY set, AUTH_ACCOUNTS unset). Because auth.py falls back to a public hardcoded DEFAULT_TOKEN_SECRET and /auth-status and /login freely mint guest JWTs, combined_dependency honored a guest token before ever checking the API key, exposing document read/upload/delete, graph mutation, and query endpoints. No public exploit is identified at time of analysis, but the underlying fix (PR #3319) ships a regression test showing that forging a valid guest token with the default secret is trivial; fixed in 1.5.4.

Authentication Bypass Lightrag
NVD GitHub
CVSS 8.8
HIGH PATCH This Week

Webhook signature-verification bypass in PraisonAI before 4.6.78 lets unauthenticated attackers forge Svix 'message.received' events when the framework runs in AgentMail webhook mode. Because incoming payloads are trusted without validating the Svix signature (CWE-287), an attacker can POST crafted JSON to the webhook endpoint and cause configured agents to process attacker-chosen sender addresses and message bodies. A vendor patch exists (4.6.78); there is no public exploit identified at time of analysis and it is not listed in CISA KEV.

Authentication Bypass Praisonai
NVD GitHub
CVSS 8.8
HIGH PATCH This Week

Authentication bypass in PraisonAI before 4.6.78 lets a remote, unauthenticated attacker reach the Call API agent-invocation endpoints when the deployment runs with PRAISONAI_CALL_AUTH=disabled. Because the localhost-only safeguard derives the bind host from the client-supplied HTTP Host header, an attacker on the network can send a spoofed 'Host: 127.0.0.1' header to defeat the restriction and both enumerate and invoke registered agents. Vendor patch is available (reported by VulnCheck); no public exploit identified at time of analysis and it is not listed in CISA KEV.

Authentication Bypass Praisonai
NVD GitHub
CVSS 6.3
MEDIUM PATCH This Month

Authentication bypass in the n8n Chat Trigger node allows unauthenticated network access to protected webhook endpoints when the node is explicitly configured with n8n User Auth - a non-default operator setting. Affected releases span all 1.x builds before 1.123.22, the entire 2.0.0-2.9.2 range, and 2.10.0. No public exploit code or active exploitation (CISA KEV) has been identified at time of analysis; the CVSS 4.0 score of 6.3 with AT:P correctly reflects that real-world exposure is bounded by the non-default configuration prerequisite.

Authentication Bypass N8n
NVD GitHub
EPSS 0% CVSS 8.1
HIGH POC PATCH This Week

Authentication bypass in the Shibboleth WordPress plugin before 2.5.4 lets remote unauthenticated attackers forge identity headers and log in when the HTTP header identity mode is enabled without an anti-spoofing key. Because the plugin fails open rather than closed, any request carrying identity headers is trusted as an authenticated session, and with automatic account creation plus the default administrator role mapping an attacker can provision and sign in as a brand-new administrator. Rated CVSS 8.1 (CWE-287); publicly available exploit code exists (WPScan), but it is not listed in CISA KEV.

Authentication Bypass WordPress Shibboleth
NVD WPScan VulDB
EPSS 0% CVSS 9.8
CRITICAL Act Now

Authentication bypass in Ciena Navigator Network Control Suite (NCS 8.1), Manage Control Plane (MCP ≤ 8.0), and Blue Planet components (Inventory, Orchestration, Route Optimization & Analysis, Unified Assurance & Analytics, Planner Plus) allows an unauthenticated network attacker to manipulate HTTP request paths and headers to reach protected functionality while also evading audit logging. Rated CVSS 9.8 with a fully remote, low-complexity, no-interaction vector, this flaw hands attackers administrative-level access to carrier-grade network control and orchestration platforms. No public exploit identified at time of analysis and the CVE is not listed in CISA KEV, but the trivial exploitation profile makes it a high-priority patch for affected operators.

Authentication Bypass
NVD VulDB
EPSS 0% CVSS 8.0
HIGH PATCH Exploit Unlikely This Week

Elevation of privilege in the Microsoft Windows RPC API lets an unauthenticated attacker on an adjacent network gain higher privileges by exploiting an improper authentication weakness (CWE-287), provided a user is lured into an interaction. The flaw spans a broad range of client and server builds from Windows Server 2012 through Windows Server 2025 and Windows 10 1607 through Windows 11 26H1. No public exploit identified at time of analysis; the issue was reported by Microsoft, which has released a fix.

Authentication Bypass Microsoft Windows 10 Version 1607 +17
NVD

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