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TI-2026-23173 Aliases CVE-2026-29002GHSA-6g6q-gcm9-395j

CouchCMS Privilege Escalation via f_k_levels_list Parameter

Priority HIGH 72CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

CouchCMS contains a privilege escalation vulnerability that allows authenticated Admin-level users to create SuperAdmin accounts by tampering with the f_k_levels_list parameter in user creation requests. Attackers can modify the parameter value from 4 to 10 in the HTTP request body to bypass authorization validation and gain full application control, circumventing restrictions on SuperAdmin account creation and privilege assignment.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00443 38th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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
CouchCMSCouchCMSup to 2.4.0—No fix listedCNA
  • CouchCMS VendorCouchCMS Affected up to 2.4.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:couchcms:couchcms:*:*:*:*:*:*:*:*up to 2.4VulnerableCouchCMS
  • cpe:2.3:a:couchcms:couchcms:*:*:*:*:*:*:*:* Versions up to 2.4 Vulnerable ·CouchCMS

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29002
  2. 2026-10-03 Alias added: GHSA-6g6q-gcm9-395j
  3. 2026-10-07 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Exploit 1

Other 1

  • TI-2025-13688 CouchCMS reCAPTCHA config.example.php hard-coded key CVSS 4.0MEDIUM 6.3
  • TI-2023-22047 An open redirect vulnerability in the sanitize_url() parameter of CouchCMS v2.3 allows… CVSS 3.1MEDIUM 6.1
  • TI-2025-41101 ** Disputed ** An Information Disclosure vulnerability in CouchCMS 2.4 allow an Admin… CVSS 3.1MEDIUM 6.5

Sources

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