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Description

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.

PUBLISHED Reserved 2026-03-03 | Published 2026-04-10 | Updated 2026-04-10 | Assigner VulnCheck




HIGH: 8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-639 Authorization Bypass Through User-Controlled Key

Product status

Default status
unknown

Any version
affected

Credits

Piyush Kumar Shukla finder

References

gist.github.com/...arshukla/477e2d2bbbe8cc3ec0d640c50f0cf9e1 technical-description exploit

www.couchcms.com/ product

www.vulncheck.com/...scalation-via-f-k-levels-list-parameter third-party-advisory

cve.org (CVE-2026-29002)

nvd.nist.gov (CVE-2026-29002)

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