CVE-2025-12033
📋 TL;DR
This stored XSS vulnerability in the Simple Banner WordPress plugin allows authenticated administrators to inject malicious scripts that execute when users view affected pages. It affects WordPress multi-site installations and sites where unfiltered_html capability is disabled. Attackers could steal session cookies, redirect users, or deface websites.
💻 Affected Systems
- Simple Banner 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
Administrator account compromise leading to full site takeover, data theft, malware distribution to visitors, and complete website defacement.
Likely Case
Session hijacking of other administrators, website defacement, or credential theft from logged-in users.
If Mitigated
Limited impact due to requiring administrator access and specific WordPress configurations; primarily affects multi-site environments.
🎯 Exploit Status
Requires administrator-level access and specific WordPress configurations; exploitation involves injecting scripts via the pro_version_activation_code parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.0.11 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Simple Banner plugin. 4. Click 'Update Now' if available. 5. Alternatively, download version 3.0.11+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable functionality
WordPressTemporarily disable the Simple Banner plugin until patched
wp plugin deactivate simple-banner
Enable unfiltered_html for administrators
WordPressEnable unfiltered_html capability for administrator roles (increases risk from other vulnerabilities)
add_filter('user_has_cap', 'enable_unfiltered_html', 10, 3); function enable_unfiltered_html($allcaps, $caps, $args) { if (isset($allcaps['administrator'])) { $allcaps['unfiltered_html'] = true; } return $allcaps; }
🧯 If You Can't Patch
- Remove administrator access from untrusted users
- Implement web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Simple Banner → Version. If version is 3.0.10 or earlier, you are vulnerable if using multi-site or unfiltered_html disabled.Check Version:
wp plugin get simple-banner --field=versionVerify Fix Applied:
Verify plugin version is 3.0.11 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to wp-admin with pro_version_activation_code parameter containing script tags
- Multiple administrator logins from unusual locations
Network Indicators:
- Outbound connections to suspicious domains from your WordPress site
- Unexpected JavaScript loading from your domain
SIEM Query:
source="wordpress.log" AND "pro_version_activation_code" AND ("<script>" OR "javascript:")