CVE-2026-30829
📋 TL;DR
This vulnerability allows unauthenticated attackers to access unpublished status pages and internal monitoring data in Checkmate installations. Any organization running self-hosted Checkmate versions before 3.4.0 is affected, potentially exposing sensitive infrastructure information.
💻 Affected Systems
- Checkmate
⚠️ 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Attackers obtain detailed internal infrastructure data, including unpublished incident reports, server configurations, and monitoring metrics, enabling reconnaissance for further attacks.
Likely Case
Unauthorized users access unpublished status pages containing internal system information, potentially revealing operational details and incident history.
If Mitigated
Limited exposure of non-critical monitoring data with proper network segmentation and access controls in place.
🎯 Exploit Status
Simple HTTP GET request to vulnerable endpoint with minimal technical skill required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.4.0
Vendor Advisory: https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-57xf-wg6w-fjrr
Restart Required: Yes
Instructions:
1. Backup your Checkmate configuration and database. 2. Stop the Checkmate service. 3. Update to version 3.4.0 using your package manager or manual installation. 4. Restart the Checkmate service. 5. Verify the fix by testing the vulnerable endpoint.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to Checkmate API endpoints using firewall rules or reverse proxy configuration.
iptables -A INPUT -p tcp --dport [CHECKMATE_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [CHECKMATE_PORT] -j DROP
Reverse Proxy Authentication
allAdd authentication layer in front of Checkmate using nginx or Apache with basic auth.
location /api/v1/status-page/ { auth_basic "Restricted"; auth_basic_user_file /etc/nginx/.htpasswd; }
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Checkmate from untrusted networks.
- Disable status page functionality entirely if not required for operations.
🔍 How to Verify
Check if Vulnerable:
Send GET request to /api/v1/status-page/[any_url] endpoint without authentication. If it returns unpublished status page data, the system is vulnerable.Check Version:
checkmate --version or check package manager for installed versionVerify Fix Applied:
After patching, attempt the same unauthenticated request. It should return 401 Unauthorized or empty response.📡 Detection & Monitoring
Log Indicators:
- Unusual volume of GET requests to /api/v1/status-page/* endpoints
- Requests from unexpected IP addresses to status page API
Network Indicators:
- Unauthenticated HTTP GET requests to status page endpoints
- Traffic patterns showing enumeration of status page URLs
SIEM Query:
source="checkmate.log" AND (uri="/api/v1/status-page/*" AND NOT (user!="" OR auth_success="true"))