CVE-2025-26923
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the Event post WordPress plugin allows attackers to inject malicious scripts into web pages. When users view pages containing the malicious content, the scripts execute in their browsers. All WordPress sites using vulnerable versions of the Event post plugin are affected.
💻 Affected Systems
- Event post 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 administrator session cookies, take over WordPress admin accounts, deface websites, or redirect users to malicious sites.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies or credentials, potentially compromising user accounts.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited. Attackers need some level of access to inject malicious content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.9.9 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Go to Plugins → Installed Plugins. 3. Find 'Event post' plugin. 4. Click 'Update Now' if available. 5. Alternatively, download version 5.9.9+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Event post plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate event-post
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Add to nginx config: add_header Content-Security-Policy "default-src 'self'; script-src 'self'";
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Restrict plugin access to trusted users only and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for Event post version ≤5.9.8Check Version:
wp plugin get event-post --field=versionVerify Fix Applied:
Confirm Event post plugin version is 5.9.9 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to event-post endpoints containing script tags
- Multiple failed login attempts after suspicious plugin activity
Network Indicators:
- Outbound connections to unknown domains from your WordPress site
- Unexpected JavaScript includes in page responses
SIEM Query:
source="wordpress.log" AND "event-post" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")