CVE-2026-118264

CVE-2026-118264 · Echo: Rejected WebSocket upgrades can bypass Echo route-level access controls

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Echo is a Go web framework. From 4.0.0 until 4.16.1 and 5.4.1, Echo's Proxy middleware selects a raw tunnel from a client WebSocket upgrade request before verifying that the configured upstream accepted the upgrade. If the upstream rejects the upgrade with an ordinary keep-alive response, later HTTP requests on the connection are sent directly to that upstream without passing through Echo's router or route-specific middleware. This can bypass authentication or authorization enforced only by Echo routes, but requires an accessible proxy route, a cooperating rejected-upgrade response, and a target without independent upstream authorization. This issue is fixed in 4.16.1 and 5.4.1.

CVSS 9.1 · Kritisch · EPSS 0,4%

Veröffentlicht

2026-10-28T19:03:01.533Z

Aktualisiert

2026-10-28T19:03:01.533Z

Technologie-Stack: system

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