CVE-2026-29002

HighPublic PoC

Published: 10 April 2026

Published

10 April 2026

Modified

16 April 2026

KEV Added

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Patch

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

EPSS Score 0.0004 12.9th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-29002 is a high-severity Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability in Couchcms Couchcms. Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 12.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploitation for Privilege Escalation (T1068). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Validates user-supplied parameters like f_k_levels_list to prevent tampering that bypasses authorization and enables privilege escalation.

AC-3 Access Enforcement good match

prevent

Enforces approved authorizations to block Admin users from creating SuperAdmin accounts via tampered privilege parameters.

AC-2 Account Management partial match

prevent

Manages account creation and privileged account assignment processes to mitigate unauthorized SuperAdmin account generation.

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

The vulnerability description directly describes a privilege escalation path (Admin to SuperAdmin) achieved by exploiting an authorization bypass in the user creation flow, which maps to T1068 Exploitation for Privilege Escalation.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD 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.

Deeper analysisAI

CVE-2026-29002, published on 2026-04-10, is a privilege escalation vulnerability in CouchCMS. The issue allows authenticated Admin-level users to create SuperAdmin accounts by tampering with the f_k_levels_list parameter in user creation requests. Specifically, attackers can modify the parameter value from 4 to 10 in the HTTP request body, bypassing authorization validation and circumventing restrictions on SuperAdmin account creation and privilege assignment. It carries a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H) and is associated with CWE-639 (Authorization Bypass Through User-Controlled Key).

An authenticated Admin-level user (PR:H) can exploit this vulnerability remotely over the network (AV:N) with low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation enables the creation of a SuperAdmin account, granting full application control and resulting in high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H).

Advisories and additional details are available in referenced sources, including the VulnCheck advisory at https://www.vulncheck.com/advisories/couchcms-privilege-escalation-via-f-k-levels-list-parameter, a GitHub gist at https://gist.github.com/thepiyushkumarshukla/477e2d2bbbe8cc3ec0d640c50f0cf9e1, and the CouchCMS website at https://www.couchcms.com/.