CVE-2025-49869
📋 TL;DR
This CVE describes a PHP object injection vulnerability in the Eventin WordPress plugin caused by unsafe deserialization of untrusted data. Attackers can exploit this to execute arbitrary code on affected WordPress sites. All WordPress installations using Eventin plugin versions up to 4.0.31 are vulnerable.
💻 Affected Systems
- Arraytics Eventin (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
Remote code execution leading to complete system compromise, data theft, website defacement, or ransomware deployment.
Likely Case
Unauthenticated attackers gain shell access, install backdoors, create admin users, or steal sensitive data from the WordPress database.
If Mitigated
With proper web application firewalls and input validation, exploitation attempts are blocked, limiting impact to failed attack attempts.
🎯 Exploit Status
Public exploit details available on Patchstack. PHP object injection vulnerabilities are commonly weaponized due to their potential for RCE.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.32 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Eventin plugin. 4. Click 'Update Now' if update available. 5. Alternatively, download latest version from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Eventin Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate eventin
Web Application Firewall Rule
allBlock serialized object payloads in HTTP requests
# Configure WAF to block patterns containing: O:[0-9]+:"
O:8:"stdClass"
C:11:"ArrayObject"
🧯 If You Can't Patch
- Implement strict input validation to reject serialized data in user inputs
- Deploy web application firewall with rules to detect and block PHP object injection attempts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Eventin → Version. If version is 4.0.31 or lower, system is vulnerable.Check Version:
wp plugin get eventin --field=versionVerify Fix Applied:
Verify Eventin plugin version is 4.0.32 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests containing serialized PHP objects
- Unexpected file creation in wp-content/uploads
- New admin user creation in WordPress logs
- PHP error logs showing unserialize() warnings
Network Indicators:
- HTTP POST requests with serialized object payloads (O:8, C:11 patterns)
- Outbound connections from WordPress server to unknown IPs
SIEM Query:
source="wordpress.log" AND ("unserialize" OR "O:" OR "C:") AND status=200