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CVE-2026-71485— Centrifugo: Client-forgeable headers emulation lets any client spoof headers forwarded to proxy backends

Quick assessment

Affected
centrifugal centrifugo
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Centrifugo 是一款开源的、可伸缩的实时消息服务器。在 6.9.0 版本之前，Centrifugo 会通过 中的 、 以及 ，将客户端控制的协议连接请求头（ ）映射进行复制。此外， 中的 路径、 中的 路径，以及 中的 路径，均可能将预允许（allowlisted）的值转发为受信任的后端请求头或元数据值。当后端服务依赖此类请求头进行身份验证或授权时，远程客户端可以在连接、刷新、订阅、发布、RPC 及相关代理调用中伪造如 之类的请求头。对于单向 gRPC 传输协议，不存在任何传输层的 HTTP 头可以覆盖已仿

CVSS 9.1 · Critical EPSS 0.42% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
centrifugal centrifugo < 6.9.0 affected
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I. Basic Information for CVE-2026-71485

Vulnerability Information
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Vulnerability Title
Centrifugo: Client-forgeable headers emulation lets any client spoof headers forwarded to proxy backends
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
centrifugal centrifugo < 6.9.0 -

II. Public POCs for CVE-2026-71485

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12120 chars
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III. Intelligence Information for CVE-2026-71485

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Patches & Fixes for CVE-2026-71485 (1)

Vendor Advisories for CVE-2026-71485 (1)

Vendor Pages for CVE-2026-71485 (1)

IV. Related Vulnerabilities

Same product: centrifugo
Same vendor: centrifugal
Same weakness: CWE-290

V. Comments for CVE-2026-71485

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