CVE-2026-20915

MEDIUM

Stored cross-site scripting in Pending Changes sidebar

Title source: cna

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.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory

https://checkmk.com/werk/19526

Scores

CVSS v3 5.4

EPSS 0.0015

EPSS Percentile 4.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-79

Status published

Products (2)

checkmk/checkmk 2.5.0 b1

Checkmk GmbH/Checkmk 2.5.0b1 - 2.5.0b2

Published Mar 31, 2026

Tracked Since Mar 31, 2026