CVE-2022-1903
📋 TL;DR
The ARMember WordPress plugin before version 3.4.8 contains an authentication bypass vulnerability that allows unauthenticated attackers to reset passwords of any user, including administrators, by exploiting missing security checks in an AJAX endpoint. This affects all WordPress sites running vulnerable versions of the ARMember plugin, potentially leading to complete site compromise.
💻 Affected Systems
- ARMember WordPress Plugin
📦 What is this software?
Armember by Armemberplugin
⚠️ Risk & Real-World Impact
Worst Case
Complete site takeover where attackers gain administrative access, install backdoors, steal sensitive data, deface the site, or use it for further attacks.
Likely Case
Attackers reset administrator passwords to gain full control of the WordPress site, potentially leading to data theft, malware installation, or site defacement.
If Mitigated
With proper access controls and monitoring, impact is limited to temporary disruption while passwords are reset and accounts are restored.
🎯 Exploit Status
Exploitation requires only knowledge of target usernames and can be performed via simple HTTP requests to the vulnerable AJAX endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.4.8
Vendor Advisory: https://wpscan.com/vulnerability/28d26aa6-a8db-4c20-9ec7-39821c606a08
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find ARMember plugin and update to version 3.4.8 or later. 4. Verify update completed successfully.
🔧 Temporary Workarounds
Disable ARMember Plugin
linuxTemporarily disable the vulnerable plugin until patching is possible.
wp plugin deactivate armember-membership
Restrict AJAX Access
allBlock access to the vulnerable AJAX endpoint via web application firewall or .htaccess rules.
RewriteEngine On
RewriteRule ^wp-admin/admin-ajax\.php\?action=arm_reset_user_password - [F,L]
🧯 If You Can't Patch
- Immediately disable the ARMember plugin if patching is not possible.
- Implement strong monitoring for unauthorized password reset attempts and user account changes.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for ARMember version. If version is below 3.4.8, the site is vulnerable.Check Version:
wp plugin get armember-membership --field=versionVerify Fix Applied:
Confirm ARMember plugin version is 3.4.8 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with action=arm_reset_user_password parameter
- Multiple failed login attempts followed by successful password reset for privileged accounts
Network Indicators:
- HTTP POST requests to WordPress AJAX endpoints from unexpected IP addresses
- Traffic patterns showing password reset requests without preceding authentication
SIEM Query:
source="web_server" AND uri="/wp-admin/admin-ajax.php" AND query="action=arm_reset_user_password"