CVE-2026-20915 Details
Description
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.
A stored cross-site scripting vulnerability has been identified in Checkmk version 2.5.0 (beta) prior to 2.5.0b2. This vulnerability allows authenticated users with permission to create pending changes to inject malicious JavaScript into the Pending Changes sidebar. The injected script would execute in the browsers of other users viewing the sidebar. The issue arises because the sidebar did not properly sanitize change attributes before rendering, enabling the injection of harmful scripts.
Users can upgrade to Checkmk version 2.5.0b2 or 2.6.0b1 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 31, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://checkmk.com/werk/19526 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| checkmk checkmk | 2.5.0 b1 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 25, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 2, 2026 | Initial Analysis | [email protected] |
| Mar 31, 2026 | New CVE Received | [email protected] |