CVE-2025-6720
📋 TL;DR
The Vchasno Kasa WordPress plugin has an unauthenticated data deletion vulnerability that allows attackers to clear log files without authentication. This affects all WordPress sites using the plugin version 1.0.3 or earlier. Attackers can exploit this to delete audit trails and potentially cover other malicious activities.
💻 Affected Systems
- Vchasno Kasa 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 delete critical audit logs to cover up other attacks like data exfiltration or privilege escalation, making incident investigation impossible.
Likely Case
Attackers clear plugin logs to hide evidence of reconnaissance or other malicious activities, reducing forensic visibility.
If Mitigated
With proper logging and monitoring, the log clearing would be detected, but the logs themselves would still be lost.
🎯 Exploit Status
Simple HTTP request to the vulnerable endpoint can trigger the vulnerability without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.4
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Go to Plugins → Installed Plugins. 3. Find 'Vchasno Kasa' plugin. 4. Click 'Update Now' if available. 5. Alternatively, download version 1.0.4 from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily deactivate the vulnerable plugin until patched.
wp plugin deactivate mrkv-vchasno-kasa
Web Application Firewall Rule
allBlock requests to the vulnerable clear_all_log() endpoint.
Add WAF rule to block POST requests to */wp-admin/admin-ajax.php with action=mrkv_vchasno_kasa_clear_all_log
🧯 If You Can't Patch
- Disable the Vchasno Kasa plugin immediately
- Implement external logging to a secure, immutable storage system
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for Vchasno Kasa version 1.0.3 or earlier.Check Version:
wp plugin get mrkv-vchasno-kasa --field=versionVerify Fix Applied:
Verify plugin version is 1.0.4 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- POST requests to /wp-admin/admin-ajax.php with action=mrkv_vchasno_kasa_clear_all_log
- Sudden clearing of plugin log files
Network Indicators:
- Unusual POST requests to WordPress admin-ajax endpoint from unauthenticated sources
SIEM Query:
source="wordpress.log" AND "mrkv_vchasno_kasa_clear_all_log" AND status=200🔗 References
- https://plugins.trac.wordpress.org/browser/mrkv-vchasno-kasa/trunk/classes/mrkv-setup.php#L245
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3328827%40mrkv-vchasno-kasa&new=3328827%40mrkv-vchasno-kasa&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/cd03483a-f46c-4e17-8b58-df87b0ad7fa3?source=cve
