CVE-2021-36874
📋 TL;DR
This vulnerability allows authenticated WordPress users to access or modify data belonging to other users through insecure direct object references in the uListing plugin. It affects WordPress sites running uListing plugin versions 2.0.5 and earlier. Attackers need at least subscriber-level access to exploit this flaw.
💻 Affected Systems
- WordPress uListing plugin
📦 What is this software?
Ulisting by Stylemixthemes
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could access, modify, or delete sensitive listing data, user information, or administrative content belonging to other users, potentially leading to data breach, privilege escalation, or content manipulation.
Likely Case
Authenticated users with minimal privileges could view or modify other users' listing data, compromising data confidentiality and integrity within the plugin's functionality.
If Mitigated
With proper access controls and input validation, only authorized users can access their own data, preventing unauthorized data exposure.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple once authentication is obtained. The vulnerability is well-documented in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.6
Vendor Advisory: https://wordpress.org/plugins/ulisting/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find uListing plugin. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 2.0.6+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the uListing plugin until patched to prevent exploitation
wp plugin deactivate ulisting
Access Restriction
allRestrict user registration and limit authenticated user access to trusted individuals only
🧯 If You Can't Patch
- Implement strict access controls and input validation at application level
- Monitor and audit all authenticated user activities with uListing plugin
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins → uListing version. If version is 2.0.5 or lower, system is vulnerable.Check Version:
wp plugin get ulisting --field=versionVerify Fix Applied:
Verify uListing plugin version is 2.0.6 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to uListing endpoints by authenticated users
- Multiple failed authorization attempts on uListing objects
- User accessing other users' listing IDs
Network Indicators:
- HTTP requests to uListing endpoints with modified object IDs
- Pattern of requests accessing sequential object IDs
SIEM Query:
source="wordpress" AND (uri_path="/wp-json/ulisting/*" OR uri_path="/wp-admin/admin-ajax.php") AND (parameters CONTAINS "id=" OR parameters CONTAINS "user_id=")🔗 References
- https://patchstack.com/database/vulnerability/ulisting/wordpress-ulisting-plugin-2-0-5-authenticated-insecure-direct-object-references-idor-vulnerability
- https://wordpress.org/plugins/ulisting/#developers
- https://patchstack.com/database/vulnerability/ulisting/wordpress-ulisting-plugin-2-0-5-authenticated-insecure-direct-object-references-idor-vulnerability
- https://wordpress.org/plugins/ulisting/#developers
