CVE-2026-20915 | THREATINT

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.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-31 | Updated 2026-03-31 | Assigner Checkmk

HIGH: 8.5CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status

unaffected

2.5.0b1 (semver) before 2.5.0b2

affected

References

checkmk.com/werk/19526 vendor-advisory

cve.org (CVE-2026-20915)

nvd.nist.gov (CVE-2026-20915)

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