CVE-2026-35523

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductStrawberry Graphql

PublishedApr 7, 2026

First seenApr 7, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

strawberry strawberry_graphql0.312.3 or later
strawberry-graphql0.312.3 or later

Affected products

Product	Affected versions	Fixed in
strawberry strawberry_graphql	v < 0.312.3	0.312.3
strawberry-graphqlPyPI	v < 0.312.3	0.312.3

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.