CVE-2025-28933
📋 TL;DR
A Cross-Site Request Forgery (CSRF) vulnerability in the MaxA/B WordPress plugin allows attackers to perform unauthorized actions as authenticated users, leading to stored cross-site scripting (XSS). This affects WordPress sites using MaxA/B plugin versions up to 2.2.2. Attackers can inject malicious scripts that execute when other users view affected pages.
💻 Affected Systems
- maxfoundry MaxA/B 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 inject persistent malicious scripts that steal admin credentials, redirect users to malicious sites, or perform administrative actions leading to complete site compromise.
Likely Case
Attackers inject malicious scripts that steal user session cookies or credentials, potentially leading to account takeover and privilege escalation.
If Mitigated
With proper CSRF protections and content security policies, impact is limited to unauthorized plugin configuration changes.
🎯 Exploit Status
Exploitation requires tricking authenticated users into visiting malicious pages while logged in. The CSRF leads to stored XSS payload injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 2.2.2
Vendor Advisory: https://patchstack.com/database/wordpress/plugin/maxab/vulnerability/wordpress-maxa-b-plugin-2-2-2-csrf-to-stored-xss-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find MaxA/B plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and remove plugin until patched version is released.
🔧 Temporary Workarounds
Implement CSRF Tokens
WordPressAdd CSRF protection to MaxA/B plugin forms if you cannot update immediately
Requires custom PHP development to add nonce verification to plugin forms
Content Security Policy
WordPressImplement strict CSP headers to mitigate XSS impact
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' https:;"
Or use WordPress security plugins to configure CSP
🧯 If You Can't Patch
- Disable MaxA/B plugin immediately
- Restrict plugin access to trusted administrators only using role-based access controls
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for MaxA/B version. If version is 2.2.2 or earlier, you are vulnerable.Check Version:
wp plugin list --name=maxab --field=version (if WP-CLI installed) or check WordPress admin plugins pageVerify Fix Applied:
After updating, verify MaxA/B version is greater than 2.2.2 in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to MaxA/B admin endpoints without referrer headers
- Multiple failed CSRF token validations in WordPress debug logs
- Unexpected plugin configuration changes in WordPress activity logs
Network Indicators:
- Cross-origin requests to MaxA/B admin endpoints
- Suspicious iframe or form submissions from external domains
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" OR uri_path CONTAINS "maxab") AND http_method="POST" AND referrer NOT CONTAINS domain