What is CVE-2026-7765?

CVE-2026-7765 is a medium-severity vulnerability in Checkmk, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2026-06-08.

How severe is CVE-2026-7765?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Checkmk

CVE-2026-7765

Incorrect authorization in the User Messages dashboard widget in Checkmk <2.5.0p5 causes the message-fetching endpoints to return the dashboard creator's messages rather than the viewer's, allowing an attacker who knows a valid public dash…

Vulnerability class: Broken Access Control

EPSS: 0.002 (8.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Checkmk — versions 2.5.0
Checkmk Gmbh — versions 2.5.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security@checkmk.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-7765?: CVE-2026-7765 is a medium-severity vulnerability in Checkmk, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2026-06-08.
How severe is CVE-2026-7765?: Medium severity. CVSS v3 base score is 5.3 out of 10.