Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, an unauthenticated visitor can submit a comment whose email or website metadata is rendered without sufficient attribute and URL encoding by listComments() in comments-bundle/contao/dca/tl_comments.php. When a backend user opens the Comments module, attacker-controlled script can execute in the Contao backend origin under that user's session. Unpublished comments remain visible to moderators, so moderation does not prevent exposure. This issue is fixed in versions 5.3.50 and 5.7.12.
Metrics
Affected Vendors & Products
References
History
Sat, 10 Oct 2026 08:30:00 +0000
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ssvc
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Fri, 09 Oct 2026 20:45:00 +0000
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Contao
Contao contao |
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| Vendors & Products |
Contao
Contao contao |
Fri, 09 Oct 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, an unauthenticated visitor can submit a comment whose email or website metadata is rendered without sufficient attribute and URL encoding by listComments() in comments-bundle/contao/dca/tl_comments.php. When a backend user opens the Comments module, attacker-controlled script can execute in the Contao backend origin under that user's session. Unpublished comments remain visible to moderators, so moderation does not prevent exposure. This issue is fixed in versions 5.3.50 and 5.7.12. | |
| Title | Contao: Cross-site scripting in the comments bundle | |
| Weaknesses | CWE-116 CWE-79 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-10-09T19:29:55.396Z
Updated: 2026-10-09T19:51:45.890Z
Reserved: 2026-10-08T22:34:49.291Z
Link: CVE-2026-107845
Updated: 2026-10-09T19:51:40.383Z
Status : Deferred
Published: 2026-10-09T20:17:10.457
Modified: 2026-10-16T17:17:04.113
Link: CVE-2026-107845
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