CVE-2026-115935
highThe app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user.
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/craftcms/cms 7004884b-51e2-48e8-b4a2-5ca29e80453e
- https://github.com/craftcms/cms/releases/tag/5.11.2 7004884b-51e2-48e8-b4a2-5ca29e80453e
- https://github.com/craftcms/cms/security/advisories/GHSA-9hp6-3565-gvh5 7004884b-51e2-48e8-b4a2-5ca29e80453e
- https://www.hckrt.com/hacktivity/HCKRT-WM3VSE 7004884b-51e2-48e8-b4a2-5ca29e80453e