CVE-2025-14548
📋 TL;DR
The Calendar plugin for WordPress versions up to 1.3.16 contains a stored cross-site scripting vulnerability in the 'event_desc' parameter. Authenticated attackers with Contributor-level access or higher can inject malicious scripts that execute when users view calendar pages, potentially compromising user sessions or redirecting to malicious sites. This requires administrators to have enabled lower-privilege users to manage calendar events via plugin settings.
💻 Affected Systems
- WordPress Calendar 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, perform actions as administrators, install backdoors, or redirect users to phishing sites, leading to full site compromise.
Likely Case
Attackers inject malicious scripts to steal user session cookies or redirect users to malicious sites, potentially compromising user accounts and data.
If Mitigated
With proper user role restrictions and input validation, impact is limited to defacement or minor data exposure.
🎯 Exploit Status
Exploitation requires authenticated access with Contributor role or higher and administrator configuration allowing lower-privilege users to manage events.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3.17 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset?new=3419088%40calendar%2Ftrunk&old=3122280%40calendar%2Ftrunk
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Calendar plugin. 4. Click 'Update Now' if available. 5. If no update appears, manually download version 1.3.17+ from WordPress.org and replace plugin files.
🔧 Temporary Workarounds
Disable event management for non-administrators
allPrevent Contributor and Author roles from managing calendar events via plugin settings
Implement WAF rules
allAdd web application firewall rules to block XSS payloads in event_desc parameter
🧯 If You Can't Patch
- Disable the Calendar plugin entirely until patched
- Restrict user roles: Only allow Administrators to manage calendar events
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Calendar plugin version. If version is 1.3.16 or lower, system is vulnerable.Check Version:
wp plugin list --name=calendar --field=version (if WP-CLI installed)Verify Fix Applied:
After updating, verify Calendar plugin version shows 1.3.17 or higher in WordPress admin plugins list.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to calendar.php with script tags in parameters
- Multiple event creation/modification attempts by non-admin users
Network Indicators:
- HTTP requests containing <script> tags in event_desc parameter
- Unusual outbound connections from calendar pages
SIEM Query:
source="wordpress" AND (uri_path="*calendar.php*" AND (param="event_desc" AND value="*<script>*"))🔗 References
- https://plugins.trac.wordpress.org/browser/calendar/trunk/calendar.php#L2154
- https://plugins.trac.wordpress.org/browser/calendar/trunk/calendar.php#L899
- https://plugins.trac.wordpress.org/changeset?new=3419088%40calendar%2Ftrunk&old=3122280%40calendar%2Ftrunk
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2e61489d-a433-4d44-bb12-8c84204922b9?source=cve
