Description
The "NagVis" component within Checkmk is vulnerable to reflected cross-site scripting. An attacker can craft a malicious link that will execute arbitrary JavaScript in the context of the browser once clicked. The attack can be performed on both authenticated and unauthenticated users.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Checkmk | NagVis | NagVis 1.9.40 – < 1.9.42, Checkmk 2.3.0p2 – < 2.3.0p10 | 1.9.42 |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nagvis | 1:1.9.42-1 | — |
| Debian 13 | nagvis | 1:1.9.42-1 | — |
| Debian 12 | nagvis | No fix yet | — |
| Debian 11 | nagvis | 1:1.9.25-2+deb11u1 | DLA-4149-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | nagvis | No fix yet | — |
| Ubuntu 22.04 LTS | nagvis | No fix yet | — |
| Ubuntu 18.04 LTS | nagvis +1 | No fix yet | — |
| Ubuntu 16.04 LTS | nagvis | 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 2
- DLA-4149-1 nagvis - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2024-1618 Checkmk: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 4, 2025
References
- https://korelogic.com/Resources/Advisories/KL-001-2025-001.txt third-party-advisory
- https://www.nagvis.org/downloads/changelog/1.9.42 release-notes
- https://checkmk.com/werks?version=2.3.0p10 release-notes