CVE-2025-39665

5.3 MEDIUM

Published: December 03, 2025 Modified: December 19, 2025

Description

User enumeration in Nagvis' Checkmk MultisiteAuth before version 1.9.48 allows an unauthenticated attacker to enumerate Checkmk usernames.

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0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Patch Vendor Advisory Exploit Third Party Advisory

Source: security@checkmk.com

Patch

Source: security@checkmk.com

Release Notes Vendor Advisory

2 reference(s) from NVD

CVSS v3 Score

5.3 / 10.0

EPSS (Exploit Probability)

0.0%

15th percentile

Exploitation Status

Not in CISA KEV

CWE-203

nagvis