CVE-2025-65961
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-25

Last updated on: 2025-12-03

Assigner: GitHub, Inc.

Description
Contao is an Open Source CMS. From version 4.0.0 to before 4.13.57, before 5.3.42, and before 5.6.5, it is possible to inject code into the template output that will be executed in the browser in the front end and back end. This issue has been patched in versions 4.13.57, 5.3.42, and 5.6.5. A workaround for this issue involves not using the affected templates or patch them manually.
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Meta Information
Published
2025-11-25
Last Modified
2025-12-03
Generated
2026-06-16
AI Q&A
2025-11-25
EPSS Evaluated
2026-06-15
NVD
CVE-2025-65961
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
contao contao From 4.0.0 (inc) to 4.13.57 (exc)
contao contao From 5.0.0 (inc) to 5.3.42 (exc)
contao contao From 5.4.0 (inc) to 5.6.5 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CWE-87 The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax.
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Executive Summary

This vulnerability in Contao CMS allows an attacker to inject code into the template output, which will then be executed in the browser on both the front end and back end. This means malicious code can run within the context of the website, potentially leading to unauthorized actions or data exposure. The issue affects versions from 4.0.0 up to but not including 4.13.57, 5.3.42, and 5.6.5, where it has been patched.

Impact Analysis

The vulnerability can lead to the execution of injected code in users' browsers, which may result in unauthorized access, data leakage, or manipulation of website content. Since the code runs in the context of the website, it could compromise both front end and back end operations, potentially affecting the integrity and confidentiality of the system.

Mitigation Strategies

To mitigate this vulnerability, immediately update Contao to version 4.13.57, 5.3.42, or 5.6.5 or later where the issue is patched. As a workaround, avoid using the affected templates or patch them manually to prevent code injection in the template output.

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