Nezha Monitoring: Nezha WebSocket server stream discloses cross-tenant server telemetry to authenticated members

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.5 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2026-47124: 0.34% estimated exploitation activity in the next 30 days; percentile 27.04 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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. Details The server WebSocket route is registered under the optional-auth group in cmd/dashboard/controller/controller.go:71-73: serverStream treats any CtxKeyAuthorizedUser as a member, without checking admin role or per-server ownership, in cmd/dashboard/controller/ws.go:123-139: The authorization boolean is then used as a full/guest switch in getServerStat in cmd/dashboard/controller/ws.go:160-184: For authenticated members, GetSortedList() returns all servers and server.Host is not filtered. There is no call to server.HasPermission(c). The streamed response model in model/serverapi.go:5-20 includes server ID/name, public note, host…

Published by the source

23 May 2026, 00:18 UTC

Last modified by the source

26 Jun 2026, 21:28 UTC

Source last checked

26 Oct 2026, 15:24 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-hvv7-hfrh-7gxj

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# Patch Next advisory brief: CVE-2026-47124

Advisory: Nezha Monitoring: Nezha WebSocket server stream discloses cross-tenant server telemetry to authenticated members
IDs: CVE-2026-47124, GHSA-hvv7-hfrh-7gxj
Record: https://patchnext.com/advisories/cve-2026-47124 (revision 1, source checked 26 Oct 2026, 15:24 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/nezhahq/nezha 1.14.15-0.20260517034128-05e5da253519. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/nezhahq/nezha: affected >= 1.4.0, < 1.14.15-0.20260517034128-05e5da253519; fixed in 1.14.15-0.20260517034128-05e5da253519

## Suggested inspection (read-only)
- Go github.com/nezhahq/nezha: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/nezhahq/nezha.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hvv7-hfrh-7gxj (GitHub-reviewed advisory GHSA-hvv7-hfrh-7gxj lists affected ranges: Go github.com/nezhahq/nezha >=1.4.0 <1.14.15-0.20260517034128-05e5da253519)

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