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

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
strawberry-graphql / strawberry	affected < 0.312.3

CWE

CWE-306

References

https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-vpwc-v33q-mq89

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.