CVE-2021-24739
📋 TL;DR
The Logo Carousel WordPress plugin before version 3.4.2 contains an authorization bypass vulnerability that allows users with Contributor-level permissions to duplicate and view private posts created by other users. This affects WordPress sites using vulnerable versions of the plugin, potentially exposing sensitive content.
💻 Affected Systems
- Logo Carousel WordPress Plugin
📦 What is this software?
Logo Carousel by Shapedplugin
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain access to confidential private posts, potentially exposing sensitive business information, unpublished content, or proprietary data.
Likely Case
Internal users with Contributor roles can view private posts they shouldn't have access to, violating content privacy controls.
If Mitigated
With proper role-based access controls and plugin updates, the risk is limited to authorized users only viewing content they're permitted to see.
🎯 Exploit Status
Exploitation requires authenticated access with at least Contributor permissions. The vulnerability is well-documented in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.4.2
Vendor Advisory: https://wpscan.com/vulnerability/2afadc76-93ad-47e1-a224-e442ac41cbce
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Logo Carousel plugin. 4. Click 'Update Now' if update available. 5. Alternatively, download version 3.4.2+ from WordPress repository and replace existing plugin files.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched
wp plugin deactivate logo-carousel
Role Restriction
allTemporarily restrict Contributor role permissions or remove users from Contributor role
wp user list --role=contributor --field=ID
wp user set-role <user_id> subscriber
🧯 If You Can't Patch
- Remove Contributor role from all users or restrict to trusted personnel only
- Monitor user activity logs for unauthorized access to private posts
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins → Installed PluginsCheck Version:
wp plugin list --name=logo-carousel --field=versionVerify Fix Applied:
Confirm Logo Carousel plugin version is 3.4.2 or higher📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /wp-admin/admin-ajax.php with action=logo_carousel_duplicate
- User with Contributor role accessing private post IDs
Network Indicators:
- Unusual AJAX requests from Contributor-level users to duplicate endpoints
SIEM Query:
source="wordpress.log" AND "logo_carousel_duplicate" AND user_role="contributor"