CVE-2026-115935

HighCVSS 8.8/10Last modified 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.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-94

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
craftcmscms>= 5.0.0, < 5.11.2; >= 4.0.0, < 4.18.9

References

Timeline

Published
Oct 23, 2026
Last modified
Oct 23, 2026
NVD status
Received

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