WebSocket Vulnerability in Nezha Monitoring Tool Affects User Data Privacy
CVE-2026-47124

6.5MEDIUM

Key Information:

Vendor

Nezhahq

Status
Nezha
Vendor
CVE Published:
12 June 2026

What is CVE-2026-47124?

Nezha Monitoring, a lightweight monitoring tool for servers and websites, has a vulnerability that allows any authenticated non-admin user to access the server-status WebSocket. This unauthorized access exposes telemetry information for all monitored servers, including those owned by other users. While the server list API enforces permission checks, the WebSocket stream mistakenly allows any authenticated user to receive an unfiltered view of all server data. This significant oversight poses a risk to user privacy and data integrity. The issue was addressed in version 2.0.9, highlighting the importance of rigorous access controls in monitoring systems.

Affected Version(s)

nezha >= 1.4.0, < 2.0.9

References

https://github.com/nezhahq/nezha/security/advisories/GHSA...
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CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.