Contao: Cross-site request forgery in custom backend actions

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107848
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-09 21:17:02 UTC
Updated2026-10-16 17:17:04 UTC
DescriptionContao 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.

Risk And Classification

Primary CVSS: v3.1 3.5 LOW from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

EPSS: 0.001130000 probability, percentile 0.013390000 (date 2026-10-16)

Problem Types: CWE-352 | CWE-352 CWE-352: Cross-Site Request Forgery (CSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.5LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.1CNADECLARED3.5LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Contao Contao affected >= 4.0.0, < 5.3.50 Not specified
CNA Contao Contao affected >= 5.4.0-RC1, < 5.7.12 Not specified

References

ReferenceSourceLinkTags
github.com/contao/contao/security/advisories/GHSA-9ff2-p842-45wq [email protected] github.com
github.com/contao/contao/releases/tag/5.7.12 [email protected] github.com
github.com/contao/contao/commit/34dd27ee6739f10568d3d95d8784862255c925b4 [email protected] github.com
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