High severity · published Apr 10, 2026
CVE-2026-29002
CouchCMS Privilege Escalation via f_k_levels_list Parameter
7.2
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
CouchCMS · CouchCMS
through 2.4.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-29002
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-29002
Exploit
https://gist.github.com/thepiyushkumarshukla/477e2d2bbbe8cc3ec0d640c50f0cf9e1
Product
https://www.couchcms.com/
Third Party Advisory
https://www.vulncheck.com/advisories/couchcms-privilege-escalation-via-f-k-levels-list-parameter
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