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CVE-2026-47124

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

6.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.34%Up 0.3 points since Jun 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.5

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

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.

Record
CVE-2026-47124
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
EUVDEUVD-2026-36594 6.5

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.

Record
EUVD-2026-36594
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-hvv7-hfrh-7gxj 6.5

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

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:

optionalAuth := api.Group("", optionalAuthMw)
optionalAuth.GET("/ws/server", commonHandler(serverStream))

serverStream treats any CtxKeyAuthorizedUser as a member, without checking admin role or per-server ownership, in cmd/dashboard/controller/ws.go:123-139:

u, isMember := c.Get(model.CtxKeyAuthorizedUser)
var userId uint64
if isMember {
    userId = u.(*model.User).ID
}
...
stat, err := getServerStat(count == 0, isMember)

The authorization boolean is then used as a full/guest switch in getServerStat in cmd/dashboard/controller/ws.go:160-184:

if authorized {
    serverList = singleton.ServerShared.GetSortedList()
} else {
    serverList = singleton.ServerShared.GetSortedListForGuest()
}
...
servers = append(servers, model.StreamServer{
    ID:           server.ID,
    Name:         server.Name,
    PublicNote:   utils.IfOr(withPublicNote, server.PublicNote, ""),
    DisplayIndex: server.DisplayIndex,
    Host:         utils.IfOr(authorized, server.Host, server.Host.Filter()),
    State:        server.State,
    CountryCode:  countryCode,
    LastActive:   server.LastActive,
})

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/server_api.go:5-20 includes server ID/name, public note, host details, runtime state, country code, last active time, and global online count. Host and state fields include platform version, agent version, CPU/GPU names, memory/disk/swap totals, architecture, virtualization, boot time, CPU load, memory/disk/swap usage, network transfer/speed, uptime, TCP/UDP/process counts, temperatures, and GPU utilization, as defined in model/host.go:20-38 and model/host.go:100-112.

The normal list endpoint has the expected object-level authorization. GET /api/v1/server is registered with listHandler in cmd/dashboard/controller/controller.go:113, and listHandler filters each returned object with HasPermission in cmd/dashboard/controller/controller.go:263-291:

filtered := filter(c, data)
...
return slices.DeleteFunc(s, func(e E) bool {
    return !e.HasPermission(ctx)
})

The shared permission model in model/common.go:44-56 allows admins to see all objects but restricts members to objects whose UserID matches their user ID:

if user.Role == RoleAdmin {
    return true
}
return user.ID == c.UserID

Mitigations checked:

  • Guests receive GetSortedListForGuest() and Host.Filter() output, but authenticated members bypass both guest restrictions.
  • HideForGuest only affects unauthenticated guests, not members.
  • The normal /api/v1/server list endpoint uses listHandler and is not affected in the same way.
  • No owner/admin filter is applied in the WebSocket path.

Candidate score: 12/14

  • Reachability: 2, default WebSocket API
  • Attacker control: 1, attacker controls authentication state and connection
  • Privilege required: 1, authenticated member
  • Sink impact: 2, cross-tenant sensitive telemetry disclosure
  • Mitigation weakness: 2, no object-level auth in the WebSocket path
  • Default exposure: 2, endpoint is part of default dashboard
  • Safe PoC feasibility: 2, can be verified with local users/servers or statically

Exploitability gate: statically confirmed

  • Reachable source: GET /api/v1/ws/server
  • Default/common configuration: dashboard API exposed by default
  • Missing/bypassed mitigation:…
Record
GHSA-hvv7-hfrh-7gxj
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
NVD 6.5

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.

Record
CVE-2026-47124
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSV 6.5

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

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.

Record
CVE-2026-47124
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSVGHSA-hvv7-hfrh-7gxj 6.5

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

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:

optionalAuth := api.Group("", optionalAuthMw)
optionalAuth.GET("/ws/server", commonHandler(serverStream))

serverStream treats any CtxKeyAuthorizedUser as a member, without checking admin role or per-server ownership, in cmd/dashboard/controller/ws.go:123-139:

u, isMember := c.Get(model.CtxKeyAuthorizedUser)
var userId uint64
if isMember {
    userId = u.(*model.User).ID
}
...
stat, err := getServerStat(count == 0, isMember)

The authorization boolean is then used as a full/guest switch in getServerStat in cmd/dashboard/controller/ws.go:160-184:

if authorized {
    serverList = singleton.ServerShared.GetSortedList()
} else {
    serverList = singleton.ServerShared.GetSortedListForGuest()
}
...
servers = append(servers, model.StreamServer{
    ID:           server.ID,
    Name:         server.Name,
    PublicNote:   utils.IfOr(withPublicNote, server.PublicNote, ""),
    DisplayIndex: server.DisplayIndex,
    Host:         utils.IfOr(authorized, server.Host, server.Host.Filter()),
    State:        server.State,
    CountryCode:  countryCode,
    LastActive:   server.LastActive,
})

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/server_api.go:5-20 includes server ID/name, public note, host details, runtime state, country code, last active time, and global online count. Host and state fields include platform version, agent version, CPU/GPU names, memory/disk/swap totals, architecture, virtualization, boot time, CPU load, memory/disk/swap usage, network transfer/speed, uptime, TCP/UDP/process counts, temperatures, and GPU utilization, as defined in model/host.go:20-38 and model/host.go:100-112.

The normal list endpoint has the expected object-level authorization. GET /api/v1/server is registered with listHandler in cmd/dashboard/controller/controller.go:113, and listHandler filters each returned object with HasPermission in cmd/dashboard/controller/controller.go:263-291:

filtered := filter(c, data)
...
return slices.DeleteFunc(s, func(e E) bool {
    return !e.HasPermission(ctx)
})

The shared permission model in model/common.go:44-56 allows admins to see all objects but restricts members to objects whose UserID matches their user ID:

if user.Role == RoleAdmin {
    return true
}
return user.ID == c.UserID

Mitigations checked:

  • Guests receive GetSortedListForGuest() and Host.Filter() output, but authenticated members bypass both guest restrictions.
  • HideForGuest only affects unauthenticated guests, not members.
  • The normal /api/v1/server list endpoint uses listHandler and is not affected in the same way.
  • No owner/admin filter is applied in the WebSocket path.

Candidate score: 12/14

  • Reachability: 2, default WebSocket API
  • Attacker control: 1, attacker controls authentication state and connection
  • Privilege required: 1, authenticated member
  • Sink impact: 2, cross-tenant sensitive telemetry disclosure
  • Mitigation weakness: 2, no object-level auth in the WebSocket path
  • Default exposure: 2, endpoint is part of default dashboard
  • Safe PoC feasibility: 2, can be verified with local users/servers or statically

Exploitability gate: statically confirmed

  • Reachable source: GET /api/v1/ws/server
  • Default/common configuration: dashboard API exposed by default
  • Missing/bypassed mitigation:…
Record
GHSA-hvv7-hfrh-7gxj
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSVGO-2026-5439 No score

Nezha Monitoring: Nezha WebSocket server stream discloses cross-tenant server telemetry to authenticated members in github.com/nezhahq/nezha

Nezha Monitoring: Nezha WebSocket server stream discloses cross-tenant server telemetry to authenticated members in github.com/nezhahq/nezha

Record
GO-2026-5439
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/nezhahq/nezha
Go
 1.4.0 up to 1.14.15-0.20260517034128-05e5da253519
1.14.15-0.20260517034128-05e5da253519
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-47124 is a medium vulnerability (CVSS 6.5) in Nezhahq Nezha, published May 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 27th percentile. Fixed in github.com/nezhahq/nezha 1.14.15-0.20260517034128-05e5da253519.

References

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