CVE-2025-39665: Nagvis

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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

Affected products

• Nagvis Nagvis: before 1.9.48 (fixed in 1.9.48)

Published 2025-12-03. Last modified 2026-06-17.