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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Checkmk | Checkmk | 2.2.0, 2.3.0 – < 2.3.0p46, 2.4.0 – < 2.4.0p25, 2.5.0b1 – < 2.5.0 | 2.3.0p46 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | check-mk | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | check-mk | No fix yet | — |
Advisories 1
- WID-SEC-2026-0983 Checkmk: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 7, 2026
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