Quick answers
- Is CVE-2026-115935 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-115935 being exploited in the wild.
- How severe is CVE-2026-115935?
- High severity, with a CVSS score of 8.8, published 23 October 2026.
- Which products and versions are affected?
- Craft CMS.
- Is there a fix for CVE-2026-115935?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-115935 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-115935?
- Check whether you run Craft CMS. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The app/process-api-response-headers action fails to validate or sanitize the X-Craft-Plugin-Licenses header from API responses, allowing any authenticated user with accessCp permission to inject newline characters. These are passed unsanitized to the .env file writer, enabling CRLF injection to redefine CRAFT_SECURITY_KEY. With a known key, an attacker can forge signed login redirects containing Twig system() callbacks for code execution.
Affected products
- Craft CMS
Timeline
- 2026-10-23: disclosed