# CVE-2022-4939: WCFM Membership <= 2.10.0 - Unauthenticated Privilege Escalation

> Unauthenticated attackers can escalate privileges to administrator by modifying membership registration settings due to missing capability checks.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Apr 2023
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-qxmh-28j4-pv6f

## What is CVE-2022-4939?

CVE-2022-4939 is a critical missing authorization vulnerability in wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace, published on 5 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

THe WCFM Membership plugin for WordPress is vulnerable to privilege escalation in versions up to, and including 2.10.0, due to a missing capability check on the wp_ajax_nopriv_wcfm_ajax_controller AJAX action that controls membership settings. This makes it possible for unauthenticated attackers to modify the membership registration form in a way that allows them to set the role for registration to that of any user including administrators. Once configured, the attacker can then register as an administrator.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2022-4939?

It affects 1 product.


Products: Wclovers Wcfm Membership.

## How do I fix CVE-2022-4939?

No fix has been published for CVE-2022-4939 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-4939 being exploited?

There is no known exploitation of CVE-2022-4939 in the wild and no public exploit code.

Public exploit code:

- https://github.com/BaconCriCRi/PoC-CVE-2022-4939- (github_poc): https://github.com/BaconCriCRi/PoC-CVE-2022-4939-

## Other vulnerabilities in wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace

- [CVE-2023-2276](https://insights.sbomify.com/CVE-2023-2276/): Auth bypass in WCFM Membership – WooCommerce Memberships for Multivendor Marketplace (critical 9.8)
- [CVE-2022-4940](https://insights.sbomify.com/CVE-2022-4940/): WCFM Membership <= 2.10.0 - Missing Authorization (high 7.3)
- [CVE-2022-4941](https://insights.sbomify.com/CVE-2022-4941/): WCFM Membership <= 2.9.10 - Cross-Site Request Forgery (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-4939 and fix it if it is affected.

What it is: CVE-2022-4939 is a critical missing authorization vulnerability in wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace, published on 5 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-4939 in the wild and no public exploit code.

Affected product: wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace. 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-2022-4939/ (Markdown: https://insights.sbomify.com/CVE-2022-4939/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-4939
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-4939
- OSV: https://osv.dev/vulnerability/CVE-2022-4939

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-4939/
Summaries are generated and may contain mistakes; the official description above is the record.