{"id":"CVE-2026-71485","aliases":["GHSA-9468-v6mj-fppw"],"url":"https://o3.security/vulnerability/CVE-2026-71485","summary":"Centrifugo: Client-forgeable headers emulation lets any client spoof headers forwarded to proxy backends","details":"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.","published":"2026-08-20T21:01:00.931Z","modified":"2026-08-22T03:58:10.144548318Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/centrifugal/centrifugo/commit/84d38cea1dd2efa24375a148817a974c8727f4b0","label":"centrifugal/centrifugo@84d38ce"},"references":[{"type":"WEB","url":"https://github.com/centrifugal/centrifugo/releases/tag/v6.9.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71485.json"},{"type":"ADVISORY","url":"https://github.com/centrifugal/centrifugo/security/advisories/GHSA-9468-v6mj-fppw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71485"},{"type":"FIX","url":"https://github.com/centrifugal/centrifugo/commit/84d38cea1dd2efa24375a148817a974c8727f4b0"},{"type":"FIX","url":"https://github.com/centrifugal/centrifugo/pull/1182"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-22T03:58:10.144548318Z"}}