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Back to active CVEs
Low · CVSS 3.5CVE-2026-107848GHSA-9FF2-P842-45WQ

Contao: Cross-site request forgery in custom backend actionsCVE-2026-107848

Answer in brief

CVE-2026-107848 records a Low severity (CVSS 3.5) vulnerability in Contao: Cross-site request forgery in custom backend actions. The current sources do not mark it as known exploited. The current feed maps contao/core-bundle (composer), contao/core-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
Low · CVSS 3.5
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 3.5. 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/core-bundle (composer), contao/core-bundle (composer), contao/contao (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
contao/core-bundlecomposer>=4.0.0,<5.3.505.3.50
contao/core-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/core-bundle, contao/core-bundle, contao/contao.
  2. 2Review the reported fix. Update contao/core-bundle to 5.3.50; contao/core-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
Upstream source description

Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, RequestTokenListener validates REQUEST_TOKEN only for POST requests, while the declarative GET guard runs only when an act parameter is present. Backend actions dispatched through the key parameter can therefore execute without a CSRF token when an authenticated backend user loads an attacker-controlled URL. Reachable actions remain limited to modules available to that user, and the advisory demonstrates destructive or state-changing actions rather than privilege escalation. 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/core-bundle package
  • Contao: The registration module re-sends activation mails on any unauthenticated POST, with no throttle and no captcha checkSame contao/core-bundle package
  • Contao: Path traversal in the images controllerSame contao/core-bundle package
  • Contao: Cross-site scripting in the comments bundleSame contao/contao package
  • Contao: Improper access control in the preview links moduleSame contao/core-bundle package
  • Contao: Improper access control in the table access voterSame contao/core-bundle package

Record context

Vulnerability class
CSRF
EPSS
Not reported
CWE IDs
CWE-352
Source
CVE List V5
Source checked
Oct 9, 2026
References
4 linked sources
Open source record