XSS in Contao
CVE-2025-29790
Contao is an Open Source CMS. Users can upload SVG files with malicious code, which is then executed in the back end and/or front end. This vulnerability is fixed in Contao 4.13.54, 5.3.30, or 5.5.6.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (11.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Contao — versions >= 4.0.0, < 4.13.54, >= 5.0.0, < 5.3.30, >= 5.4.0, < 5.5.6
Weakness classification (CWE)
References
- github.com/contao/contao/security/advisories/GHSA-vqqr-fgmh-f626 (Patch, Third Party Advisory)
- contao.org/en/security-advisories/cross-site-scripting-through-svg-uploads (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-29790?
- CVE-2025-29790 is a medium-severity vulnerability in Contao, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-03-18.
- How severe is CVE-2025-29790?
- Medium severity. CVSS v3 base score is 5.4 out of 10.