CVE-2026-115935
Control panel only API response emulation replaces "securityKey" and reaches server RCE
- State
- Published
- Severity
- 8.7 High
- Published
- Oct 23, 2026
- Updated
- Oct 23, 2026
- Reserved
- Oct 23, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | Hackrate |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Hackrate |
Weaknesses
- CWE-94 Improper Control of Generation of Code ('Code Injection')
Affected Products
| Product | Versions |
|---|---|
cmscraftcms |
|
References
- https://www.hckrt.com/hacktivity/HCKRT-WM3VSEthird-party-advisorytechnical-descriptionmitigation
- https://github.com/craftcms/cms/releases/tag/5.11.2release-notes
- https://github.com/craftcms/cmsproduct
- https://github.com/craftcms/cms/security/advisories/GHSA-9hp6-3565-gvh5third-party-advisory
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