High 8.8Published Oct 23, 2026

CVE-2026-115935Control panel only API response emulation replaces "securityKey" and reaches server RCE

Updated under an hour ago (Oct 28, 2026, 4:10 AM ET)

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It affects craftcms cms. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.37%, higher than 31% of scored CVEs.

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Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-94
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.37% (percentile 31)
Assigned by: Hackrate
NVD analysis: Awaiting Analysis
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 23, 2026

Affected products

Affected products

craftcms cms craftcms:cms (from the name)	from 5.0.0 before 5.11.2; from 4.0.0 before 4.18.9	CNA record

References

References

https://www.hckrt.com/hacktivity/HCKRT-WM3VSE	third-party-advisory, technical-description, mitigation
https://github.com/craftcms/cms/releases/tag/5.11.2	release-notes
https://github.com/craftcms/cms	product
https://github.com/craftcms/cms/security/advisories/GHSA-9hp6-3565-gvh5	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.