PT-2026-31899 · Checkmk · Checkmk

Published 2026-04-10 · Updated 2026-04-12 · CVE-2026-33456

Positive Technologies (AI Summary)

CVSS v3.1

7.6

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

Name of the Vulnerable Software and Affected Versions Checkmk versions prior to 2.5.0b4 and prior to 2.4.0p26

Description A flaw exists in Checkmk that allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands through a crafted service description. This occurs in the notification test mode.

Recommendations Update to a version equal to or greater than 2.5.0b4. Update to a version equal to or greater than 2.4.0p26.

Fix

Weakness Enumeration

CWE-140

Related Identifiers

CVE-2026-33456

Affected Products

Checkmk

References · 7

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33456 · Vendor Advisory
• https://checkmk.com/werk/17989 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33456 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-33456 · Security Note
• https://ubuntu.com/security/CVE-2026-33456 · Vendor Advisory
• https://twitter.com/CVEnew/status/2042561715163009475 · Twitter Post
• https://twitter.com/CVEarity/status/2043214579707314219 · Twitter Post