CVE-2026-28559
📋 TL;DR
wpForo Forum 2.4.14 contains an information disclosure vulnerability where unauthenticated attackers can access private and unapproved forum topics through the global RSS feed endpoint. This affects all WordPress sites running the vulnerable wpForo plugin version.
💻 Affected Systems
- wpForo Forum WordPress plugin
📦 What is this software?
Wpforo Forum by Gvectors
⚠️ Risk & Real-World Impact
Worst Case
Sensitive private forum discussions, draft topics, or restricted content could be exposed to unauthorized users, potentially revealing confidential business information, personal data, or internal communications.
Likely Case
Attackers discover and access private forum content that should only be visible to authenticated users with proper permissions, violating privacy expectations and potentially exposing sensitive discussions.
If Mitigated
With proper access controls and monitoring, exposure would be limited to non-sensitive content, but privacy violations could still occur.
🎯 Exploit Status
Exploitation requires simple HTTP requests to the RSS feed endpoint without forum ID parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.15 or later
Vendor Advisory: https://wordpress.org/plugins/wpforo/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find wpForo Forum and click 'Update Now'. 4. Verify update to version 2.4.15 or higher.
🔧 Temporary Workarounds
Disable RSS Feed
allTemporarily disable the global RSS feed functionality to prevent exploitation.
Edit wpForo settings to disable RSS feeds or modify .htaccess to block access to RSS endpoints
Access Control via Web Server
allRestrict access to RSS feed endpoints using web server configuration.
Add rewrite rules to block unauthenticated access to /wp-content/plugins/wpforo/rss.php
🧯 If You Can't Patch
- Disable wpForo plugin entirely until patched
- Implement WAF rules to block suspicious RSS feed requests
🔍 How to Verify
Check if Vulnerable:
Access /wp-content/plugins/wpforo/rss.php without parameters and check if private/unapproved content appears in the feed.Check Version:
Check WordPress plugin list or wpForo settings page for version number.Verify Fix Applied:
After updating, attempt the same RSS feed access and verify private content is no longer exposed.📡 Detection & Monitoring
Log Indicators:
- Multiple requests to /wp-content/plugins/wpforo/rss.php without forum_id parameter
- Unusual RSS feed access patterns from unauthenticated users
Network Indicators:
- HTTP GET requests to RSS endpoints without expected parameters
- Traffic spikes to RSS feed URLs
SIEM Query:
source="web_server" AND (url_path="/wp-content/plugins/wpforo/rss.php" AND NOT query_string="*forum_id=*")