Authentication bypass via client-forgeable proxy headers
Published Aug 20, 2026 · Updated Aug 25, 2026
Authentication bypass in Centrifugal Labs Centrifugo before 6.9.0 allows remote attackers to impersonate backend-trusted identities. OnClientConnecting copies the client-controlled ConnectRequest.headers map into emulated headers that proxy HTTP and gRPC paths forward as trusted backend values. Exploitation requires an allowlisted header that a proxy backend uses for authentication or authorization; resulting access is bounded by that backend's trust decisions.
Summary
What happened
Authentication bypass in Centrifugal Labs Centrifugo before 6.9.0 allows remote attackers to impersonate backend-trusted identities. OnClientConnecting copies the client-controlled ConnectRequest.headers map into emulated headers that proxy HTTP and gRPC paths forward as trusted backend values. Exploitation requires an allowlisted header that a proxy backend uses for authentication or authorization; resulting access is bounded by that backend's trust decisions.
The record
- CVE
- CVE-2026-71485
- Published
- Aug 20, 2026
- Updated
- Aug 25, 2026
- Vendor
- Centrifugal Labs
- Product
- Centrifugo
- Classifications
- CWE-290, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 20, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 6.9.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Header spoofing attack scenarioproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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