CSRF in Contao
CVE-2026-107848
Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, RequestTokenListener validates REQUEST_TOKEN only for POST requests, while the declarative GET guard runs only when an act parameter is present. Backend actions dispatched through the key parameter can therefore execute without a CSRF token when an authenticated backend user loads an attacker-controlled URL. Reachable actions remain limited to modules available to that user, and the advisory demonstrates destructive or state-changing actions rather than privilege escalation. This issue is fixed in versions 5.3.50 and 5.7.12.
Vulnerability class: CSRF (Cross-Site Request Forgery)
Published .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Contao — versions >= 4.0.0, < 5.3.50, >= 5.4.0-RC1, < 5.7.12
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-107848?
- CVE-2026-107848 is a low-severity vulnerability in Contao, classified under Cross-Site Request Forgery (CSRF). CVSS score: 3.5/10. Published 2026-10-09.
- How severe is CVE-2026-107848?
- Low severity. CVSS v3 base score is 3.5 out of 10.