Contao
CVE-2021-37626
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Code injection prevention, sandbox exec
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 7.2 (HIGH). Attack characteristics: network attack vector, low complexity, high privileges required, no user interaction not required. |
| Exploit ScenarioDerived | A remote attacker could inject and execute arbitrary code within the application by sending crafted requests to the affected application. |
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Alert meAnalysisAI
Contao is an open source CMS that allows you to create websites and scalable web applications. Rated high severity (CVSS 7.2), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Never evaluate user-controlled input as code. Use sandboxing, disable dangerous functions, apply strict input validation.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages 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 Code Injection (CWE-94), which allows attackers to inject and execute arbitrary code within the application. Contao is an open source CMS that allows you to create websites and scalable web applications. In affected versions it is possible to load PHP files by entering insert tags in the Contao back end. Installations are only affected if they have untrusted back end users who have the rights to modify fields that are shown in the front end. Update to Contao 4.4.56, 4.9.18 or 4.11.7 to resolve. If you cannot update then disable the login for untrusted back end users. Affected products include: Contao.
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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:H/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
Contao is an open source CMS that allows you to create websites and scalable web applications. In affected versions it is possible to load PHP files by entering insert tags in the Contao back end. Installations are only affected if they have untrusted back end users who have the rights to modify fields that are shown in the front end. Update to Contao 4.4.56, 4.9.18 or 4.11.7 to resolve. If you cannot update then disable the login for untrusted back end users.
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
Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.
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
Contao Managed Edition v1.5.0 was discovered to contain a remote command execution (RCE) vulnerability via the component
Multiple cross-site request forgery (CSRF) vulnerabilities in main.php in Contao (formerly TYPOlight) 2.11.0 and earlier
Contao is a powerful open source CMS that allows you to create professional websites and scalable web applications. Rate
Contao 4.x allows SQL Injection. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no auth
Contao 4.7 allows Use of a Key Past its Expiration Date. Rated critical severity (CVSS 9.8), this vulnerability is remot
Contao before 3.5.39 and 4.x before 4.7.3 has a Weak Password Recovery Mechanism for a Forgotten Password. Rated critica
Contao before 5.5.6 allows XSS via an SVG document. Rated medium severity (CVSS 5.4), this vulnerability is remotely exp
Contao is an open source content management system. Rated medium severity (CVSS 5.4), this vulnerability is remotely exp
Unauthenticated path traversal in the Contao CMS ImagesController lets remote attackers read files from the project dire
Stored cross-site scripting in the Contao CMS comments bundle lets an unauthenticated visitor submit a comment whose ema
Information disclosure in Contao CMS allows unauthenticated front-end visitors to read the titles, URLs, and indexed tex
Unauthenticated email-flooding and user-enumeration in Contao CMS: a POST to any page containing the registration module
Exploit-DB