CVE-2025-39665
Unknown
Unknown - Not Provided
BaseFortify
Publication date: 2025-12-03
Last updated on: 2025-12-04
Assigner: Checkmk GmbH
Description
Description
User enumeration in Nagvis' Checkmk MultisiteAuth before version 1.9.48 allows an unauthenticated attacker to enumerate Checkmk usernames.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| nagvis | nagvis | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-203 | The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not. |
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability impact me? :
The vulnerability can impact you by allowing attackers to gather valid usernames without authentication, which can be used as a first step in targeted attacks such as brute force or phishing, potentially leading to unauthorized access.
Can you explain this vulnerability to me?
This vulnerability is a user enumeration issue in Nagvis' Checkmk MultisiteAuth before version 1.9.48. It allows an unauthenticated attacker to discover valid Checkmk usernames by exploiting the authentication mechanism.
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