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Fencer Intel
critical 9.1

CVE-2026-71485 json

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

published 2mo ago modified 24d ago also EUVD-2026-63649 , GHSA-9468-v6mj-fppw , GO-2026-6490

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
  • centrifugal centrifugo 6.9.0

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2mo ago

Exploit prediction

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

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 Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.