CVE-2025-7821
📋 TL;DR
The WC Plus WordPress plugin has an authentication bypass vulnerability that allows unauthenticated attackers to modify the site's favicon logo base. This affects all WordPress sites running WC Plus version 1.2.0 or earlier. Attackers can exploit this without any credentials.
💻 Affected Systems
- WC Plus WordPress Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could replace the favicon with malicious content to conduct phishing attacks, damage brand reputation, or serve as a persistence mechanism for further attacks.
Likely Case
Attackers will deface the site by changing the favicon to inappropriate or misleading images, causing user confusion and damaging site credibility.
If Mitigated
With proper monitoring and quick response, impact is limited to temporary site defacement that can be quickly reverted.
🎯 Exploit Status
Exploitation requires sending a crafted AJAX request to the vulnerable endpoint without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 1.2.0
Vendor Advisory: https://wordpress.org/plugins/wc-plus/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find WC Plus plugin. 4. Click 'Update Now' if update available. 5. If no update, deactivate and remove plugin immediately.
🔧 Temporary Workarounds
Disable WC Plus Plugin
WordPressTemporarily disable the vulnerable plugin until patched version is available.
wp plugin deactivate wc-plus
Block Vulnerable AJAX Endpoint
ApacheUse web application firewall or .htaccess to block access to the vulnerable endpoint.
RewriteEngine On
RewriteRule ^wp-admin/admin-ajax\.php\?action=pluswc_logo_favicon_logo_base - [F,L]
🧯 If You Can't Patch
- Implement web application firewall rules to block unauthorized AJAX requests to admin-ajax.php
- Enable strict file permission controls and monitor for unauthorized favicon changes
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for WC Plus version 1.2.0 or earlier.Check Version:
wp plugin list --name=wc-plus --field=versionVerify Fix Applied:
Verify WC Plus plugin version is greater than 1.2.0 or plugin is completely removed.📡 Detection & Monitoring
Log Indicators:
- Unauthorized POST requests to /wp-admin/admin-ajax.php with action=pluswc_logo_favicon_logo_base
- Unexpected favicon file modifications in uploads directory
Network Indicators:
- Unusual AJAX requests from unauthenticated sources to WordPress admin endpoints
SIEM Query:
source="wordpress.log" AND (uri_path="/wp-admin/admin-ajax.php" AND query_string="*action=pluswc_logo_favicon_logo_base*")