Cross-site scripting in Contao - CVE-2025-29790
Published: March 18, 2025 / Updated: May 5, 2026
Vulnerability identifier: #VU130140
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-29790
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Contao
Affected software:
Contao
Contao
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary script code in the back end and/or front end.
The vulnerability exists due to cross-site scripting in SVG file upload handling when processing uploaded SVG files. A remote user can upload a malicious SVG file to execute arbitrary script code in the back end and/or front end.
User interaction is required for the malicious SVG content to be executed.
How to mitigate CVE-2025-29790
Install security update from vendor's website.