CVE-2026-31836: Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response

Q: How do I fix CVE-2026-31836?

checkmate: upgrade to newer than 3.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-31836 being exploited?

CVE-2026-31836 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-31836 affect?

CVE-2026-31836 affects checkmate. Severity is high (CVSS 8.1). 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

Q: How urgent is CVE-2026-31836?

Priority 39/100. High severity; Public exploit reference

Routine

HIGH 8.1UPGRADE

CVE-2026-31836 is a high-severity flaw (CVSS 8.1) affecting checkmate. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 co

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-269, CWE-285
Published	2026-03-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: bluewavelabs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 18:16 UTCPublished CVE record published
2026-06-17 10:34 UTCUpdated Record last modified

bluewavelabs checkmate UPGRADE

Affected: <= 3.5.1

Fixed in: newer than 3.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy checkmate || rpm -q checkmate || checkmate --version

2. UPGRADE to newer than 3.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade checkmate

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade checkmate

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-31836?

checkmate: upgrade to newer than 3.5.1. Exact commands for each OS are on this page.

Is CVE-2026-31836 being exploited?

CVE-2026-31836 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-31836 affect?

CVE-2026-31836 affects checkmate. Severity is high (CVSS 8.1). 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

How urgent is CVE-2026-31836?

Priority 39/100. High severity; Public exploit reference

Related CVEs

CVE-2026-30829 MEDIUM 5.3 UPGRADE Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response

References

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