CVE-2025-39665

—

CVSS 4.0

6.9 medium

EPSS

<1%p17

Published

Dec 3, 2025 (Dec 3, 2025)

Modified

Jun 17, 2026

Description

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

Vendors: nagvis
Products: nagvis
Weakness: CWE-203
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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