XSS in Contao
CVE-2025-65961
Contao is an Open Source CMS. From version 4.0.0 to before 4.13.57, before 5.3.42, and before 5.6.5, it is possible to inject code into the template output that will be executed in the browser in the front end and back end. This issue has been patched in versions 4.13.57, 5.3.42, and 5.6.5. A workaround for this issue involves not using the affected templates or patch them manually.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (5.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.3% 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, < 4.13.57, >= 5.0.0-RC1, < 5.3.42, >= 5.4.0-RC1, < 5.6.5
Weakness classification (CWE)
References
- github.com/contao/contao/security/advisories/GHSA-68q5-78xp-cwwc (Vendor Advisory)
- contao.org/en/security-advisories/cross-site-scripting-in-templates (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-65961?
- CVE-2025-65961 is a low-severity vulnerability in Contao, classified under Improper Neutralization of Alternate XSS Syntax. CVSS score: 3.3/10. Published 2025-11-25.
- How severe is CVE-2025-65961?
- Low severity. CVSS v3 base score is 3.3 out of 10.