Vulnerability · Published Apr 7, 2026 · Assigned by Checkmk

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

High 8.5

In plain English

A high-severity cross-site scripting in Checkmk from Checkmk GmbH. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 4.0)8.5High

Exploit odds (30 days)0.2%top 85.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Checkmk GmbH	Checkmk	2.2.02.3.0 – before 2.3.0p462.4.0 – before 2.4.0p252.5.0b1 – before 2.5.0

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N

References

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