CVE-2024-8427
📋 TL;DR
This vulnerability allows authenticated WordPress users with Subscriber-level access or higher to modify plugin settings and forms without proper authorization. It affects all WordPress sites using the Frontend Post Submission Manager Lite plugin up to version 1.2.2. The issue stems from missing capability checks in two administrative functions.
💻 Affected Systems
- Frontend Post Submission Manager Lite – Frontend Posting WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could reconfigure the plugin to allow unauthorized content submission, modify form behavior to capture sensitive data, or disrupt frontend posting functionality for legitimate users.
Likely Case
Malicious users could alter form settings to bypass content moderation, change submission destinations, or modify plugin behavior to suit their purposes while appearing as legitimate users.
If Mitigated
With proper user role management and network segmentation, impact would be limited to minor configuration changes within the plugin's scope.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple - attackers can send crafted AJAX requests to the vulnerable endpoints. The vulnerability is publicly documented with code references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.3 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3147218/frontend-post-submission-manager-lite/trunk/includes/classes/admin/class-fpsml-ajax-admin.php
Restart Required: No
Instructions:
1. Log into WordPress admin panel
2. Navigate to Plugins → Installed Plugins
3. Find 'Frontend Post Submission Manager Lite'
4. Click 'Update Now' if update is available
5. Alternatively, download version 1.2.3+ from WordPress.org and manually replace plugin files
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched
wp plugin deactivate frontend-post-submission-manager-lite
Restrict User Registration
allTemporarily disable new user registration to limit potential attackers
wp option update users_can_register 0
🧯 If You Can't Patch
- Implement strict user role management - review and minimize users with Subscriber+ roles
- Add web application firewall rules to block requests to /wp-admin/admin-ajax.php with suspicious parameters related to fpsml
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for 'Frontend Post Submission Manager Lite' version 1.2.2 or earlierCheck Version:
wp plugin get frontend-post-submission-manager-lite --field=versionVerify Fix Applied:
Verify plugin version is 1.2.3 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with 'action' parameter containing 'fpsml_save_global_settings' or 'fpsml_process_form_edit' from non-admin users
- Multiple configuration changes to fpsml plugin settings in short timeframes
Network Indicators:
- AJAX requests to WordPress admin-ajax.php endpoint from unexpected user roles
- Unusual traffic patterns to plugin-specific endpoints
SIEM Query:
source="wordpress.log" AND (uri_path="/wp-admin/admin-ajax.php" AND (post_data="*fpsml_save_global_settings*" OR post_data="*fpsml_process_form_edit*")) AND user_role!="administrator"🔗 References
- https://plugins.trac.wordpress.org/browser/frontend-post-submission-manager-lite/tags/1.2.2/includes/classes/admin/class-fpsml-ajax-admin.php#L25
- https://plugins.trac.wordpress.org/changeset/3147218/frontend-post-submission-manager-lite/trunk/includes/classes/admin/class-fpsml-ajax-admin.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/e84b68b6-1ce8-45fb-823f-a61158aa4d21?source=cve
