Which versions of Couchcms are affected by CVE-2026-29002?

CouchCMS contains a privilege escalation vulnerability affecting authenticated administrators who can exploit a parameter manipulation flaw to create SuperAdmin accounts, effectively bypassing…

Is there a public PoC exploit available for CVE-2026-29002?

Yes, a public proof-of-concept exploit is available for CVE-2026-29002. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-29002?

Within 24 hours: Inventory all CouchCMS deployments and document current administrative user accounts. Within 7 days: Restrict Admin-level account access to essential personnel only, implement detailed audit logging of user creation requests, and monitor for suspicious f_k_levels_list parameter modifications in HTTP POST bodies. Within 30 days: Contact CouchCMS vendor for patch timeline; evaluate alternative content management systems if patch availability remains unclear beyond 30 days.

Couchcms CVE-2026-29002

Q: What is the CVSS score of CVE-2026-29002?

CVE-2026-29002 has a CVSS 4.0 base score of 8.6 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-21384 HIGH

Authorization Bypass Through User-Controlled Key (CWE-639)

2026-04-10 VulnCheck

Privilege Escalation Authentication Bypass Couchcms

8.6

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.6 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

Apr 16, 2026 - 19:52 vuln.today

cvss_changed

PoC Detected

Apr 10, 2026 - 16:16 vuln.today

Public exploit code

EUVD ID Assigned

Apr 10, 2026 - 15:30 euvd

EUVD-2026-21384

Analysis Generated

Apr 10, 2026 - 15:30 vuln.today

CVE Published

Apr 10, 2026 - 15:11 nvd

HIGH 8.6

DescriptionCVE.org

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.

AnalysisAI

Privilege escalation in CouchCMS allows authenticated Admin-level users to create SuperAdmin accounts by manipulating the f_k_levels_list parameter during user creation requests. Attackers modify the parameter value from 4 to 10 in HTTP POST bodies to bypass authorization controls and gain unrestricted application access. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate as Admin user

Delivery

Intercept user creation HTTP request

Exploit

Modify f_k_levels_list parameter from 4 to 10

Execution

Bypass authorization validation

Persist

Create SuperAdmin account

Impact

Gain full application control