Description
User enumeration in Nagvis' Checkmk MultisiteAuth before version 1.9.48 allows an unauthenticated attacker to enumerate Checkmk usernames.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Nagvis | Nagvis | 1.9.0 – < 1.9.48 | 1.9.48 |
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 | 1:1.9.48-1 | — |
| Debian 13 | nagvis | No fix yet | — |
| Debian 12 | nagvis | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nagvis | No fix yet | — |
| Ubuntu 26.04 LTS | nagvis | No fix yet | — |
| Ubuntu 25.10 | nagvis | No fix yet | — |
| Ubuntu 24.04 LTS | nagvis | No fix yet | — |
| Ubuntu 22.04 LTS | nagvis | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | nagvis | No fix yet | — |
| Ubuntu 16.04 LTS | nagvis | No fix yet | — |
Advisories 1
- WID-SEC-2025-2893 Checkmk: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen BSI CERT-Bund (WID) · Dec 18, 2025