CVE-2026-7765: Checkmk

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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 dashboard share token to read the issuer's personal messages by sending requests to the underlying endpoint, even without a User Messages widget present.

Affected products

• Checkmk Checkmk: version 2.5.0 only

Published 2026-06-08. Last modified 2026-10-06.