Auth bypass in Couchcms
CVE-2026-29002
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.004 (35.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Couchcms — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Exploit, technical-description, Third Party Advisory, exploit)
- disclosure@vulncheck.com (Product, product)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-29002?
- CVE-2026-29002 is a high-severity vulnerability in Couchcms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.2/10. Published 2026-04-10.
- How severe is CVE-2026-29002?
- High severity. CVSS v3 base score is 7.2 out of 10.