CVE-2026-107845Contao: Cross-site scripting in the comments bundle
Updated under an hour ago ()
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It affects contao. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.27%, higher than 18% of scored CVEs.
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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 Unpublished comments remain visible to moderators, so moderation does not prevent exposure.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.
- CVSS
- 9.3 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-79, CWE-116
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.27% (percentile 18)
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Oct 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
contao contao contao:contao (from the name) | from 4.0.0, < 5.3.50; from 5.4.0-RC1, < 5.7.12 | CNA record |
References
- https://github.com/contao/contao/security/advisories/GHSA-628f-v4f6-p37rx-refsource-confirm
- https://github.com/contao/contao/commit/22505d5f79bc1a7f52e2cba5fddf6007e1f0408ax-refsource-misc
- https://github.com/contao/contao/releases/tag/5.3.50x-refsource-misc
- https://github.com/contao/contao/releases/tag/5.7.12x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.