CVE-2025-39666

CVE-2025-39666 affects Checkmk in multiple versions: 2.2.0 (EOL), 2.3.0 before 2.3.0p46, 2.4.0 before 2.4.0p25, and 2.5.0 beta before 2.5.0b3. A site user can escalate to root by manipulating files in the site context that are processed when the omd command is run by root. This yields a local pri...

CVE-2026-20915 Stored cross-site scripting in Pending Changes sidebar

Stored cross-site scripting XSS in Checkmk version 2.5.0 beta before 2.5.0b2 allows authenticated users with permission to create pending changes to inject malicious JavaScript into the Pending Changes sidebar, which will execute in the browsers of other users viewing the sidebar...

CVE-2026-20915

Checkmk CVE-2026-20915 describes a stored XSS in the Pending Changes sidebar affecting Checkmk 2.5.0 (beta) before 2.5.0b2. An authenticated user with permission to create pending changes can inject JavaScript, which then executes in the browsers of other users viewing the sidebar. Impact per CVS...

PT-2026-29251

Name of the Vulnerable Software and Affected Versions Checkmk versions prior to 2.5.0b2 Description A stored cross-site scripting issue exists in Checkmk. Authenticated users with permission to create pending changes can inject malicious JavaScript into the Pending Changes sidebar. This injected...