How severe is CVE-2026-31836?

CVE-2026-31836 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-31836 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31836?

CVE-2026-31836 affects Bluewavelabs Checkmate. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31836?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-31836 have an EU (EUVD) identifier?

Yes. CVE-2026-31836 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13744.

When was CVE-2026-31836 published?

CVE-2026-31836 was published on 2026-03-20 and last updated on 2026-06-17.

CVE-2026-31836

CVE-2026-31836 is a high-severity vulnerability in Bluewavelabs Checkmate with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-269.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13744
Weakness: CWE-269
Affected product: Bluewavelabs Checkmate
Published: 2026-03-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-31836?: CVE-2026-31836 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-31836 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31836?: CVE-2026-31836 affects Bluewavelabs Checkmate. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31836?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-31836 have an EU (EUVD) identifier?: Yes. CVE-2026-31836 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13744.
When was CVE-2026-31836 published?: CVE-2026-31836 was published on 2026-03-20 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:bluewavelabs:checkmate:*:*:*:*:*:*:*:*

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