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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.

• https://github.com/labstack/echo/security/advisories/GHSA-cxf3-9h37-7rr8 x_refsource_CONFIRM
• https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaaec x_refsource_MISC
• https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f x_refsource_MISC
• https://github.com/labstack/echo/releases/tag/v4.16.1 x_refsource_MISC
• https://github.com/labstack/echo/releases/tag/v5.4.1 x_refsource_MISC