Craft Cms
CVE-2021-27903
CRITICAL
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization checks on every request
MITRE ATT&CK
1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. |
| Exploit ScenarioDerived | A remote attacker could access resources or perform actions without proper authorization checks by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
An issue was discovered in Craft CMS before 3.6.7. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Missing Authorization vulnerability could allow attackers to access resources or perform actions without proper authorization checks.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Implement role-based access control, validate authorization on every request server-side, apply principle of least privilege.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in composer
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Missing Authorization (CWE-862), which allows attackers to access resources or perform actions without proper authorization checks. An issue was discovered in Craft CMS before 3.6.7. In some circumstances, a potential Remote Code Execution vulnerability existed on sites that did not restrict administrative changes (if an attacker were somehow able to hijack an administrator's session). Affected products include: Craftcms Craft Cms. Version information: before 3.6.7..
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
An issue was discovered in Craft CMS before 3.6.7. In some circumstances, a potential Remote Code Execution vulnerability existed on sites that did not restrict administrative changes (if an attacker were somehow able to hijack an administrator's session).
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
Affected Products (CPE)NVD
Craft CMS versions 3.x through 5.x contain a critical remote code execution vulnerability (CVSS 10.0) that allows unauth
Craft CMS stores arbitrary content provided by unauthenticated users in session files. Rated medium severity (CVSS 6.9),
Craft CMS is a platform for creating digital experiences. Rated critical severity (CVSS 9.8), this vulnerability is remo
Craft is a flexible, user-friendly CMS for creating custom digital experiences on the web and beyond. Rated critical sev
Craft CMS up to v3.7.31 was discovered to contain a SQL injection vulnerability via the GraphQL API endpoint. Rated crit
The SEOmatic component before 3.3.0 for Craft CMS allows Server-Side Template Injection that leads to RCE via malformed
RCE in Craft CMS before 4.17.0-beta.1/5.9.0-beta.1 via template injection for authenticated admins. PoC and patch availa
Authenticated remote code execution in Craft CMS versions 5.0.0-RC1 through 5.8.20 and 4.0.0-RC1 through 4.16.16 lets an
SQL injection in Craft CMS 4.0.0-RC1 through 4.16.17 and 5.0.0-RC1 through 5.8.21 allows authenticated Control Panel use
An issue found in CraftCMS v.3.8.1 allows a remote attacker to execute arbitrary code via a crafted script to the Sectio
Craft CMS through 3.7.36 allows a remote unauthenticated attacker, who knows at least one valid username, to reset the a
Craft CMS 2.6.3000 allows remote attackers to execute arbitrary PHP code by using the "Assets->Upload files" screen and
Exploit-DB