CVE-2026-115935

Published: Oct 23, 2026Modified: Oct 23, 2026

8.7

Vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XShow less

Source: 7004884b-51e2-48e8-b4a2-5ca29e80453e (Secondary)

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.

Related CWEs

CWE-94

Improper Control of Generation of Code ('Code Injection')

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

References (4)

https://github.com/craftcms/cms

Source: 7004884b-51e2-48e8-b4a2-5ca29e80453e

https://github.com/craftcms/cms/releases/tag/5.11.2

Source: 7004884b-51e2-48e8-b4a2-5ca29e80453e

https://github.com/craftcms/cms/security/advisories/GHSA-9hp6-3565-gvh5

Source: 7004884b-51e2-48e8-b4a2-5ca29e80453e

https://www.hckrt.com/hacktivity/HCKRT-WM3VSE

Source: 7004884b-51e2-48e8-b4a2-5ca29e80453e

Timeline

No history available yet.