CVE-2026-9549

4.8 MEDIUM

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 version...

Published: 2026-06-08 · Last updated: 2026-06-08

Severity and scoring

CVSS: 4.8 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CWE: CWE-79

Affected products

Vendor	Product
checkmk	checkmk

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-9549
[Vendor advisory]https://checkmk.com/werk/17993

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