CVE-2022-4939

CRITICAL

WCFM Membership < 2.10.0 - Unauthenticated Privilege Escalation via wp_ajax_nopriv_wcfm_ajax_controller

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2022-4939. PoCs published by BaconCriCRi.

AI-analyzed exploit summary This repository contains a writeup describing an authentication bypass vulnerability in a WordPress plugin. The attacker can exploit the wp_ajax_nopriv_wcfm_ajax_controller AJAX action to modify the membership registration form, allowing users to register with administrator privileges.

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.

Exploits (1)

nomisec WRITEUP
by BaconCriCRi · poc
https://github.com/BaconCriCRi/PoC-CVE-2022-4939-

This repository contains a writeup describing an authentication bypass vulnerability in a WordPress plugin. The attacker can exploit the wp_ajax_nopriv_wcfm_ajax_controller AJAX action to modify the membership registration form, allowing users to register with administrator privileges.

Classification
Writeup 90%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Theoretical
Target: WordPress plugin (specific plugin not named)
No auth needed
Prerequisites: Access to the wp_ajax_nopriv_wcfm_ajax_controller AJAX endpoint
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Scores

CVSS v3 9.8
EPSS 0.0210
EPSS Percentile 79.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-862
Status published
Products (2)
wclovers/WCFM Membership – WooCommerce Memberships for Multivendor Marketplace < 2.10.0
wclovers/wcfm_membership < 2.10.1
Published Apr 05, 2023
Tracked Since Feb 18, 2026