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  4. CVE 2026 107845 contao cross site scripting in the comments bundle
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Back to active CVEs
Critical · CVSS 9.3CVE-2026-107845GHSA-628F-V4F6-P37R

Contao: Cross-site scripting in the comments bundleCVE-2026-107845

Answer in brief

CVE-2026-107845 records a Critical severity (CVSS 9.3) vulnerability in Contao: Cross-site scripting in the comments bundle. The current sources do not mark it as known exploited. The current feed maps contao/comments-bundle (composer), contao/comments-bundle (composer), contao/contao (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 9, 2026Updated Oct 9, 2026Source checked Oct 9, 2026First seen by HOL Oct 9, 2026Material review Oct 9, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.3
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps contao/comments-bundle (composer), contao/comments-bundle (composer), contao/contao (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
contao/comments-bundlecomposer>=4.0.0,<5.3.505.3.50
contao/comments-bundlecomposer>=5.4.0-RC1,<5.7.125.7.12
contao/contaogeneric>=4.0.0 <5.3.50 || >=5.4.0-RC1 <5.7.125.3.50, 5.7.12

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for contao/comments-bundle, contao/comments-bundle, contao/contao.
  2. 2Review the reported fix. Update contao/comments-bundle to 5.3.50; contao/comments-bundle to 5.7.12; contao/contao to 5.3.50 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 9, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Contao: Protected page content is disclosed to anonymous visitors after contao.search.index_protected is disabledSame contao/contao package
  • Contao: The registration module re-sends activation mails on any unauthenticated POST, with no throttle and no captcha checkSame contao/contao package
  • Contao: Path traversal in the images controllerSame contao/contao package
  • Contao: Cross-site request forgery in custom backend actionsSame contao/contao package
  • Contao: Improper access control in the preview links moduleSame contao/contao package
  • Contao: Improper access control in the table access voterSame contao/contao package

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79, CWE-116
Source
CVE List V5
Source checked
Oct 9, 2026
References
5 linked sources
Open source record