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Fencer Vulns
critical 9.1

CVE-2026-71485 json

Centrifugo: Client-forgeable headers emulation lets any client spoof headers forwarded to proxy backends

published 2026-08-20 2 mo ago modified 2026-10-18 21 d ago also GHSA-9468-v6mj-fppw , GO-2026-6490 , EUVD-2026-63649

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

Centrifugo is an open-source scalable real-time messaging server. Prior to 6.9.0, Centrifugo copies the client-controlled protocol.ConnectRequest.headers map through OnClientConnecting in internal/client/handler.go, ConnectEvent.Headers, and SetEmulatedHeadersToContext. The requestHeaders path in internal/proxy/http.go, the requestMetadata path in internal/proxy/grpc.go, and the Consume path in internal/unigrpc/grpc.go can forward an allowlisted value as a trusted backend header or metadata value. A remote client can spoof a header such as x-trusted-user for connect, refresh, subscribe, publish, RPC, and related proxy calls when the backend relies on that header for authentication or authorization. The unidirectional gRPC transport has no transport-level HTTP header that can override the emulated value. This issue is fixed in version 6.9.0.

Patch / fix

  • go github.com/centrifugal/centrifugo 6.9.0
  • go github.com/centrifugal/centrifugo/v6 6.9.0

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/centrifugal/centrifugo
<6.9.0
all versions
6.9.0
go github.com/centrifugal/centrifugo/v3
all versions
 no fix listed
go github.com/centrifugal/centrifugo/v4
all versions
 no fix listed
go github.com/centrifugal/centrifugo/v5
all versions
 no fix listed
go github.com/centrifugal/centrifugo/v6
<6.9.0
6.9.0

Affected products

  • centrifugal centrifugo

Classification

Weakness
  • CWE-290 Authentication Bypass by Spoofing

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.