Vulnerability in Nagvis

CVE-2025-39665

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

EPSS: 0.002 (13.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Nagvis — versions 1.9.0

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

security@checkmk.com (Patch)
security@checkmk.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2025-39665?: CVE-2025-39665 is a medium-severity vulnerability in Nagvis, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2025-12-03.
How severe is CVE-2025-39665?: Medium severity. CVSS v3 base score is 5.3 out of 10.