PT-2026-26654 · Checkmate · Checkmate

Theamanrawat · Published 2026-03-20 · Updated 2026-03-22 · CVE-2026-31836

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions Checkmate versions prior to 3.5.1

Description Checkmate is a self-hosted tool for tracking server hardware, uptime, response times, and incidents. A mass assignment issue exists in the user profile update endpoint, allowing authenticated users to escalate privileges to superadmin, bypassing role-based access controls. An attacker can modify their user role to gain complete administrative access, including viewing all users, modifying configurations, and accessing sensitive data. The vulnerable endpoint is the user profile update endpoint. The vulnerability allows modification of the user role through mass assignment of parameters.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

LPE

Improper Authorization

Improper Privilege Management

Weakness Enumeration

CWE-285

CWE-269

Related Identifiers

CVE-2026-31836

GHSA-6368-X7WR-WPM2

Affected Products

Checkmate

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31836.json · Exploit
• https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-6368-x7wr-wpm2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31836 · Security Note
• https://osv.dev/vulnerability/CVE-2026-31836 · Vendor Advisory
• https://twitter.com/cyberbivash/status/2035083028695859657 · Twitter Post
• https://twitter.com/CVEnew/status/2035619783518097448 · Twitter Post
• https://twitter.com/TheHackerWire/status/2035088998558048469 · Twitter Post
• https://twitter.com/TheHackerWire/status/2035084066484265046 · Twitter Post