What is CVE-2026-33276?

CVE-2026-33276 is a medium-severity vulnerability in Checkmk, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-31.

How severe is CVE-2026-33276?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Checkmk

CVE-2026-33276

Stored cross-site scripting (XSS) in Checkmk 2.5.0 (beta) before 2.5.0b2 allows authenticated users with permission to create hosts or services to execute arbitrary JavaScript in the browsers of other users performing searches in the Unified Search feature.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (4.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Checkmk — versions 2.5.0
Checkmk Gmbh — versions 2.5.0b1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@checkmk.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-33276?: CVE-2026-33276 is a medium-severity vulnerability in Checkmk, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-31.
How severe is CVE-2026-33276?: Medium severity. CVSS v3 base score is 5.4 out of 10.