# CVE-2026-29002: CouchCMS Privilege Escalation via f_k_levels_list Parameter

> Authenticated Admin users can escalate privileges to SuperAdmin by tampering with the f_k_levels_list parameter during user creation.

- **Severity:** High 8.6 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Apr 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-6g6q-gcm9-395j

## What is CVE-2026-29002?

CVE-2026-29002 is a high-severity vulnerability in CouchCMS, published on 10 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official 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.

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

## Which versions are affected by CVE-2026-29002?

It affects 1 product.


Products: Couchcms Couchcms.

## How do I fix CVE-2026-29002?

No fix has been published for CVE-2026-29002 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-29002 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29002 exists.

## Other vulnerabilities in CouchCMS

- [CVE-2025-67004](https://insights.sbomify.com/CVE-2025-67004/): Path traversal in n/a (medium 6.5)
- [CVE-2025-15005](https://insights.sbomify.com/CVE-2025-15005/): CouchCMS reCAPTCHA config.example.php hard-coded key (medium 6.3)
- [CVE-2023-41609](https://insights.sbomify.com/CVE-2023-41609/): Open redirect in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-29002 and fix it if it is affected.

What it is: CVE-2026-29002 is a high-severity vulnerability in CouchCMS, published on 10 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29002 exists.

Affected product: CouchCMS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-29002/ (Markdown: https://insights.sbomify.com/CVE-2026-29002/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-29002
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29002
- OSV: https://osv.dev/vulnerability/CVE-2026-29002

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-29002/
Summaries are generated and may contain mistakes; the official description above is the record.