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TI-2026-80006 Aliases CVE-2026-115935GHSA-j6hf-w48h-c9f9

Craft CMS control panel users can replace security key and run code

Priority MEDIUM 40CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

Craft CMS from 5.0.0 before 5.11.2 and from 4.0.0 before 4.18.9 lets an authenticated control panel user with only accessCp permission replace the security key. The app/process-api-response-headers action accepts fake API response headers, and newline characters in X-Craft-Plugin-Licenses are written unfiltered into the .env file (CWE-94). The attacker can then forge a signed login redirect that runs a Twig system() callback on the server.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00369 30th percentileScored 2026-11-07
Fix Fixed cms (craftcms): 5.11.2, 4.18.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Craft CMScms5.0.0 to before 5.11.2; 4.0.0 to before 4.18.95.11.2, 4.18.9Patch availableCNA
  • cms VendorCraft CMS Affected 5.0.0 to before 5.11.2; 4.0.0 to before 4.18.9 Fixed in 5.11.2, 4.18.9 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*——Craft CMS
  • cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:* Versions — — ·Craft CMS

Remediation

Upgrade Craft CMS 5.x to 5.11.2 and Craft CMS 4.x to 4.18.9.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

  • Fix · CNA cms (craftcms) Fixed in 5.11.2, 4.18.9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    craftcms cms 4.18.9, 5.11.2

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2026-80008 Sandbox escape in Craft CMS lets control panel users reach RCEPriority MEDIUM 40
    Show all 2 records →

Timeline

  1. 2026-10-23 Threatist record created from CVE-2026-115935
  2. 2026-10-24 Alias added: GHSA-j6hf-w48h-c9f9
  3. 2026-10-24 Priority changed: MEDIUM → LOW
  4. 2026-10-25 EPSS moved to the below the 50th percentile
  5. 2026-11-02 CISA SSVC decision points changed
  6. 2026-11-02 Priority changed: LOW → MEDIUM

References

Advisory 2

Other 2

  • TI-2025-23503 Craft CMS Allows Remote Code Execution KEVCVSS 3.1CRITICAL 10.0
  • TI-2024-37138 RCE when PHP `register_argc_argv` config setting is enabled in craftcms/cms KEVCVSS 4.0CRITICAL 9.3
  • TI-2025-16994 Potential RCE with a compromised security key in craft/cms KEVCVSS 3.1HIGH 8.1
  • TI-2025-24595 Craft CMS stores user-provided content in session files KEVCVSS 4.0MEDIUM 6.9
  • TI-2023-22284 Craft CMS Remote Code Execution vulnerability CVSS 3.1CRITICAL 10.0
  • TI-2024-25171 Craft CMS up to v3.7.31 was discovered to contain a SQL injection vulnerability via the GraphQL API endpoint. CVSS 3.1CRITICAL 9.8
See all 203 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences