CVE-2024-2123 – This vulnerability allows unauthenticated attac... (How to Fix)

Q: What is the severity of CVE-2024-2123?

CVE-2024-2123 has a CVSS score of 7.2 (HIGH). This vulnerability allows unauthenticated attackers to inject malicious scripts into WordPress pages using the Ultimate Member plugin. When users visit compromised pages, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. All WordPress sites using Ultimate Member plugin versions up to 2.8.3 are affected.

📋 TL;DR

This vulnerability allows unauthenticated attackers to inject malicious scripts into WordPress pages using the Ultimate Member plugin. When users visit compromised pages, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. All WordPress sites using Ultimate Member plugin versions up to 2.8.3 are affected.

💻 Affected Systems

Products:

Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin for WordPress

Versions: All versions up to and including 2.8.3

Operating Systems: All operating systems running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability exists in default plugin templates; no special configuration required for exploitation.

📦 What is this software?

Ultimate Member by Ultimatemember

View all CVEs affecting Ultimate Member →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could steal administrator credentials, deface websites, redirect users to malicious sites, or install backdoors for persistent access.

🟠

Likely Case

Attackers inject malicious scripts to steal user session cookies, credentials, or perform actions on behalf of authenticated users.

🟢

If Mitigated

With proper input validation and output escaping, the vulnerability is prevented, though existing malicious scripts may need cleanup.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires minimal technical skill due to unauthenticated access and common XSS techniques.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.8.4 or later

Vendor Advisory: https://wordpress.org/plugins/ultimate-member/#developers

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Ultimate Member plugin. 4. Click 'Update Now' if available, or manually update to version 2.8.4+. 5. Verify update completes successfully.

🔧 Temporary Workarounds

Disable vulnerable templates

linux

Temporarily disable or override the vulnerable template files (members-grid.php and members-list.php) to prevent exploitation.

mv wp-content/plugins/ultimate-member/templates/members-grid.php wp-content/plugins/ultimate-member/templates/members-grid.php.bak
mv wp-content/plugins/ultimate-member/templates/members-list.php wp-content/plugins/ultimate-member/templates/members-list.php.bak

🧯 If You Can't Patch

Disable the Ultimate Member plugin entirely until patching is possible.
Implement a Web Application Firewall (WAF) with XSS protection rules to block exploitation attempts.

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin → Plugins → Installed Plugins for Ultimate Member version. If version is 2.8.3 or lower, the site is vulnerable.

Check Version:

wp plugin list --name=ultimate-member --field=version

Verify Fix Applied:

After updating, verify the plugin version shows 2.8.4 or higher in WordPress admin panel.

📡 Detection & Monitoring

Log Indicators:

Unusual POST requests to Ultimate Member endpoints with script tags or JavaScript in parameters.
Multiple failed login attempts or unexpected user registrations following XSS payload delivery.

Network Indicators:

HTTP requests containing <script> tags or JavaScript code in query parameters or POST data targeting Ultimate Member pages.

SIEM Query:

source="web_server_logs" AND (uri="*ultimate-member*" AND (query="*<script>*" OR query="*javascript:*"))

📊 Metadata

CVE ID: CVE-2024-2123

CVSS v3 Score: 7.2 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE: CWE-79

Published: March 13, 2024

Last Updated: March 5, 2025

🔗 References

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