Auth bypass in Bluewave-Labs Checkmate
CVE-2026-85390
Checkmate through 3.11.0 omits the isAllowed role guard middleware on maintenance-window, notification, and check-deletion routes, allowing read-only users to perform administrative actions. Attackers with user-role sessions can create arbitrary maintenance windows to silence alerts, modify notification channels, and delete monitor check history to erase incident evidence.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.4% 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: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/bluewave-labs/Checkmate (product)
- github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/checkRout… (technical-description)
- github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/maintenan… (technical-description)
- github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/notificat… (technical-description)
- github.com/bluewave-labs/Checkmate/issues/3916 (issue-tracking)
- www.vulncheck.com/advisories/checkmate-through-3.11.0-missing-authorization-on-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85390?
- CVE-2026-85390 is a high-severity vulnerability in Bluewave-Labs Checkmate, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-09-03.
- How severe is CVE-2026-85390?
- High severity. CVSS v3 base score is 7.1 out of 10.