CVE-2026-3466: Cross-site scripting in dashlet title

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-07 · updated 2026-06-17
Weakness: CWE-79

Description

Insufficient sanitization of dashboard dashlet title links in Checkmk 2.2.0 (EOL), Checkmk 2.3.0 before 2.3.0p46, Checkmk 2.4.0 before 2.4.0p25, and Checkmk 2.5.0 (beta) before 2.5.0 allows an attacker with dashboard creation privileges to perform stored cross-site scripting (XSS) attacks by tricking a victim into clicking a crafted dashlet title link on a shared dashboard.

Affected products

Checkmk GmbH Checkmk: 2.2.0, 2.2.0-b1, 2.2.0-b2, 2.2.0-b3, 2.2.0-b4, 2.2.0-b5 (+136)

References

https://checkmk.com/werk/19033
https://checkmk.com/werk/19583
https://www.vulncheck.com/advisories/checkmk-stored-cross-site-scripting-in-dashlet-title

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