CVE-2026-35523

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-vpwc-v33q-mq89	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:strawberry:strawberry_graphql:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-04-07 17:16

Updated : 2026-06-17 10:40

NVD link : CVE-2026-35523

Mitre link : CVE-2026-35523

CVE.ORG link : CVE-2026-35523

JSON object : View

Products Affected

strawberry

strawberry_graphql

CWE

CWE-306

Missing Authentication for Critical Function

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