Auth bypass in Bluewave-Labs Checkmate
CVE-2026-31836
Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. In versions from 3.5.1 and prior, a mass assignment vulnerability in Checkmate's user profile update endpoint allows any authenticated user to escalate their privileges to superadmin, bypassing all role-based access controls. An attacker can modify their user role to gain complete administrative access to the application, including the ability to view all users, modify critical configurations, and access sensitive system data. At time of publication, there are no publicly available patches.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Bluewave-Labs Checkmate — versions <= 3.5.1
- Bluewavelabs Checkmate
Weakness classification (CWE)
References
- github.com/bluewave-labs/Checkmate/security/advisories/GHSA-6368-x7wr-wpm2 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-31836?
- CVE-2026-31836 is a high-severity vulnerability in Bluewave-Labs Checkmate, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2026-03-20.
- How severe is CVE-2026-31836?
- High severity. CVSS v3 base score is 8.1 out of 10.