CVE-2026-115935
CVE-2026-115935 · Control panel only API response emulation replaces "securityKey" and reaches server RCE
This page contains facts from public vulnerability sources. Check the original advisory before updating.
The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user. A non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines. This lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback. This is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.
CVSS 8.7 · High · EPSS 0.4% · Fix available
- Published
- Updated
Affected products and versions
cms
- Versions
- ≥ 5.0.0, < 5.11.2: Affected (semver)
- ≥ 4.0.0, < 4.18.9: Affected (semver)
Update to 4.18.9; Update to 5.11.2