CVE-2026-20915
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
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.
Risk Assessment
An attacker can steal sessions, data, or redirect other administrators to malicious sites, compromising the confidentiality and integrity of the system.
Recommendation
It is recommended to immediately upgrade to version 2.5.0b2 or later and restrict permissions to create changes only to trusted users.
Original NVD description (English source)
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.