CVE-2025-8561
📋 TL;DR
The Ova Advent WordPress plugin has a stored XSS vulnerability in all versions up to 1.1.7. Authenticated attackers with contributor-level access or higher can inject malicious scripts via plugin shortcodes, which execute when users view affected pages. This affects all WordPress sites using vulnerable versions of the plugin.
💻 Affected Systems
- Ova Advent 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 steal admin credentials, deface websites, redirect users to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers inject malicious scripts to steal user session cookies, redirect users to phishing pages, or display unwanted content.
If Mitigated
With proper input validation and output escaping, malicious scripts would be neutralized before execution.
🎯 Exploit Status
Requires authenticated access (contributor or higher) and knowledge of WordPress shortcode usage.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 1.1.7
Vendor Advisory: https://themeforest.net/item/em4u-event-management-multipurpose-wordpress-theme/20846579#item-description__change_log
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Ova Advent plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and remove plugin.
🔧 Temporary Workarounds
Remove Contributor Access
allTemporarily restrict contributor-level access to trusted users only
Disable Plugin
allDeactivate Ova Advent plugin until patched
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Use web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Ova Advent version 1.1.7 or earlierCheck Version:
wp plugin list --name=ova-advent --field=versionVerify Fix Applied:
Verify plugin version is higher than 1.1.7 in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to WordPress admin-ajax.php with shortcode parameters
- Multiple failed login attempts followed by successful contributor login
Network Indicators:
- HTTP requests containing suspicious script tags in URL parameters or POST data
SIEM Query:
source="wordpress.log" AND ("ova advent" OR "shortcode" OR "wp-admin/admin-ajax.php") AND ("script" OR "onerror" OR "javascript:")🔗 References
- https://themeforest.net/item/em4u-event-management-multipurpose-wordpress-theme/20846579
- https://themeforest.net/item/em4u-event-management-multipurpose-wordpress-theme/20846579#item-description__change_log
- https://www.wordfence.com/threat-intel/vulnerabilities/id/da6bf521-0c22-4839-8fa6-a0d67e28cfbd?source=cve
