Cross-site request forgery in Contao - #VU165877
Published: November 11, 2026
Vulnerability identifier: #VU165877
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-352
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to replace a victim's backend login session.
The vulnerability exists due to insufficient cross-site request forgery protection in the Contao backend login form when processing login requests. A remote user can trick a victim into submitting a crafted cross-site login request to cause session replacement.
Affected software
Contao
Remediation
Install security update from vendor's website.
Contao - addressed in versions 5.3.54, 5.7.17, 6.0.6