CVE-2025-39483
📋 TL;DR
This CVE describes a code injection vulnerability in the Eventer WordPress plugin that allows attackers to execute arbitrary code through shortcode manipulation. It affects all WordPress sites running Eventer plugin versions before 3.9.9.1. Attackers can exploit this to compromise the affected WordPress installation.
💻 Affected Systems
- Eventer 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
Complete compromise of the WordPress site with remote code execution, allowing attackers to install backdoors, steal data, deface the site, or pivot to other systems.
Likely Case
Unauthorized code execution leading to website defacement, data theft, or installation of malware/backdoors on the compromised WordPress instance.
If Mitigated
Limited impact with proper input validation and output escaping preventing successful exploitation.
🎯 Exploit Status
Exploitation requires understanding of WordPress shortcode injection techniques. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.9.9.1
Vendor Advisory: https://patchstack.com/database/wordpress/plugin/eventer/vulnerability/wordpress-eventer-plugin-3-9-6-shortcode-injection-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Eventer plugin. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 3.9.9.1+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Eventer Plugin
WordPressTemporarily disable the vulnerable plugin until patched version can be installed.
wp plugin deactivate eventer
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block suspicious shortcode patterns
- Restrict plugin usage to trusted administrators only and monitor for unusual shortcode activity
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Eventer version number. If version is below 3.9.9.1, system is vulnerable.Check Version:
wp plugin get eventer --field=versionVerify Fix Applied:
Confirm Eventer plugin version is 3.9.9.1 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual shortcode patterns in WordPress logs
- Multiple failed shortcode execution attempts
- Unexpected PHP code execution in web server logs
Network Indicators:
- HTTP requests containing suspicious shortcode parameters
- Unusual POST requests to WordPress admin-ajax.php or similar endpoints
SIEM Query:
source="wordpress.log" AND ("[eventer" OR "shortcode" OR "eval(") AND status=200