CVE-2025-58861
📋 TL;DR
A Cross-Site Request Forgery (CSRF) vulnerability in the WordPress Quick Event Calendar plugin allows attackers to trick authenticated administrators into performing unintended actions, which can lead to stored cross-site scripting (XSS) attacks. This affects all WordPress sites running Quick Event Calendar versions up to and including 1.4.9. Attackers can inject malicious scripts that execute when other users visit affected pages.
💻 Affected Systems
- WordPress Quick Event 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
An attacker could inject persistent malicious JavaScript that steals administrator credentials, hijacks user sessions, defaces websites, or installs backdoors when users visit calendar pages.
Likely Case
Attackers create fake calendar events containing malicious scripts that execute when administrators or users view the calendar, potentially leading to session hijacking or credential theft.
If Mitigated
With proper CSRF protections and input validation, the attack surface is significantly reduced, though the vulnerable code remains present.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users. CSRF attacks are well-understood and weaponization is likely given the stored XSS outcome.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.0 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Quick Event Calendar and click 'Update Now' if available. 4. If manual update is needed, download version 1.5.0+ from WordPress.org, deactivate old version, upload new version, and activate.
🔧 Temporary Workarounds
Disable Quick Event Calendar plugin
allTemporarily deactivate the vulnerable plugin until patching is possible
wp plugin deactivate quick-event-calendar
Implement CSRF protection middleware
allAdd WordPress nonce verification to all plugin form submissions
🧯 If You Can't Patch
- Restrict plugin access to trusted administrators only using role-based access controls
- Implement web application firewall (WAF) rules to block suspicious calendar-related POST requests
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Quick Event Calendar version. If version is 1.4.9 or earlier, you are vulnerable.Check Version:
wp plugin get quick-event-calendar --field=versionVerify Fix Applied:
After updating, verify the plugin version shows 1.5.0 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with calendar-related actions
- Multiple failed nonce verification attempts in WordPress debug logs
Network Indicators:
- Suspicious calendar event submissions from unexpected referrers
- POST requests to calendar endpoints without proper CSRF tokens
SIEM Query:
source="wordpress.log" AND ("quick-event-calendar" OR "admin-ajax.php") AND (POST AND calendar)