CVE-2026-8078: Checkmk

Medium severity, CVSS 4.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Stored cross-site scripting in the global settings change log in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can change global settings to store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or Audit log.

Affected products

• Checkmk Checkmk: version 2.2.0 only; version 2.3.0 only; version 2.4.0 only; version 2.5.0 only

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