Cross-site request forgery in custom backend actions

Date: 2026-08-25
CVE ID: CVE-2026-XXXXX

Description

Backend users might be able to execute custom actions without providing a valid CSRF token.

Affected versions

Contao 4.0
Contao 4.1
Contao 4.2
Contao 4.3
Contao 4.4
Contao 4.5
Contao 4.6
Contao 4.7
Contao 4.8
Contao 4.9
Contao 4.10
Contao 4.11
Contao 4.12
Contao 4.13
Contao 5.0
Contao 5.1
Contao 5.2
Contao 5.3 up to 5.3.49
Contao 5.4
Contao 5.5
Contao 5.6
Contao 5.7 up to 5.7.11

Suggested solution

Upgrade to Contao 5.3.50 or 5.7.12.

More information

https://github.com/contao/contao/security/advisories/GHSA-9ff2-p842-45wq