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…
Published: 2026-04-07 · CVSS: 7.5 · CVSS 3.1
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 connection_init handshake has been completed before processing start (subscription) messages. This allows a remote attacker to skip the on_ws_connect authentication hook entirely by connecting with the graphql-ws subprotocol and sending a start message directly, without ever sending connection_init. This vulnerability is fixed in 0.312.3.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7