CVE-2026-35523 Authentication bypass in strawberry-graphql via legacy graphql-ws WebSocket subprotocol

Strawberry GraphQL is a library for creating GraphQL APIs. Strawberry up until version 0.312.3 is vulnerable to an authentication bypass on WebSocket subscription endpoints. The legacy graphql-ws subprotocol handler does not verify that a connectioninit handshake has been completed before...

CVE-2026-35523

CVE-2026-35523 affects Strawberry GraphQL up to version 0.312.3, where the legacy graphql-ws WebSocket subprotocol may bypass authentication on WebSocket subscription endpoints. The root cause is that the graphql-ws handshake (connection_init) is not verified before processing start/subscription ...