CVE-2026-71485: CWE-290: Authentication Bypass by Spoofing in centrifugal centrifugo
Centrifugo before version 6.9.0 contains an authentication bypass vulnerability due to client-controlled headers being copied and trusted by backend components. This allows a remote attacker to spoof trusted headers such as x-trusted-user, potentially bypassing authentication or authorization checks. The issue affects various proxy calls including connect, refresh, subscribe, publish, and RPC. The vulnerability is fixed in version 6.9.0.
AI Analysis
Technical Summary
Centrifugo, an open-source real-time messaging server, prior to version 6.9.0, improperly copies client-controlled protocol.ConnectRequest.headers through multiple internal components. This allows remote clients to spoof headers like x-trusted-user in connect, refresh, subscribe, publish, RPC, and related proxy calls. The backend may rely on these headers for authentication or authorization, leading to an authentication bypass (CWE-290). The unidirectional gRPC transport lacks a transport-level HTTP header to override the emulated header value, exacerbating the issue. This vulnerability is resolved in version 6.9.0.
Potential Impact
An attacker can remotely spoof trusted headers used by the backend for authentication or authorization, effectively bypassing authentication controls. This can lead to unauthorized access with high confidentiality and integrity impact, but no availability impact is noted. The CVSS score is 9.1 (critical), indicating a severe security risk.
Mitigation Recommendations
Upgrade Centrifugo to version 6.9.0 or later, where this authentication bypass vulnerability is fixed. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor advisory stating the issue is fixed in 6.9.0.
CVE-2026-71485: CWE-290: Authentication Bypass by Spoofing in centrifugal centrifugo
Description
Centrifugo before version 6.9.0 contains an authentication bypass vulnerability due to client-controlled headers being copied and trusted by backend components. This allows a remote attacker to spoof trusted headers such as x-trusted-user, potentially bypassing authentication or authorization checks. The issue affects various proxy calls including connect, refresh, subscribe, publish, and RPC. The vulnerability is fixed in version 6.9.0.
CVSS v3.1
Score 9.1critical
Affected software
pkg:github/centrifugal/centrifugoRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Centrifugo, an open-source real-time messaging server, prior to version 6.9.0, improperly copies client-controlled protocol.ConnectRequest.headers through multiple internal components. This allows remote clients to spoof headers like x-trusted-user in connect, refresh, subscribe, publish, RPC, and related proxy calls. The backend may rely on these headers for authentication or authorization, leading to an authentication bypass (CWE-290). The unidirectional gRPC transport lacks a transport-level HTTP header to override the emulated header value, exacerbating the issue. This vulnerability is resolved in version 6.9.0.
Potential Impact
An attacker can remotely spoof trusted headers used by the backend for authentication or authorization, effectively bypassing authentication controls. This can lead to unauthorized access with high confidentiality and integrity impact, but no availability impact is noted. The CVSS score is 9.1 (critical), indicating a severe security risk.
Mitigation Recommendations
Upgrade Centrifugo to version 6.9.0 or later, where this authentication bypass vulnerability is fixed. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor advisory stating the issue is fixed in 6.9.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-06T19:56:23.725Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a876c9aacd9273b4920bdfe
Added to database: 08/20/2026, 21:07:38 UTC
Last enriched: 08/20/2026, 21:22:12 UTC
Last updated: 08/20/2026, 23:38:59 UTC
Views: 6
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