Stored cross-site scripting in the service discovery active check output in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can configure active or custom checks to inject malicious HTML or JavaScript into check output that executes in the browser of an admin or a user with host read permissions when they run the check on the service discovery page.
References
History

Mon, 08 Jun 2026 13:00:00 +0000

Type Values Removed Values Added
Description Stored cross-site scripting in the service discovery active check output in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can configure active or custom checks to inject malicious HTML or JavaScript into check output that executes in the browser of an admin or a user with host read permissions when they run the check on the service discovery page.
Title Fix XSS in service discovery active check output
First Time appeared Checkmk
Checkmk checkmk
Weaknesses CWE-79
CPEs cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:*:*:*:*:*:*:*
Vendors & Products Checkmk
Checkmk checkmk
References
Metrics cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Checkmk

Published:

Updated: 2026-06-08T13:02:20.748Z

Reserved: 2026-05-26T07:04:28.900Z

Link: CVE-2026-9549

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-08T13:16:34.030

Modified: 2026-06-08T13:16:34.030

Link: CVE-2026-9549

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.