What’s Vulnerable › Vulnerabilities

CVE-2026-107848: Contao: Cross-site request forgery in custom backend actions

• Severity: low (CVSS 3.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-16
• Weakness: CWE-352

Description

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.

Affected products

• contao: from 4.0.0, < 5.3.50; from 5.4.0-RC1, < 5.7.12

References

• https://github.com/contao/contao/commit/34dd27ee6739f10568d3d95d8784862255c925b4
• https://github.com/contao/contao/releases/tag/5.7.12
• https://github.com/contao/contao/security/advisories/GHSA-9ff2-p842-45wq

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