CVE-2026-35523: Strawberry Graphql

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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 products

• Strawberry Strawberry Graphql: before 0.312.3 (fixed in 0.312.3)

Published 2026-04-07. Last modified 2026-06-17.