Authentication Bypass in Strawberry GraphQL Library by Strawberry
CVE-2026-35523

7.5HIGH

Key Information:

Vendor

Strawberry-graphql

Status
Strawberry
Vendor
CVE Published:
7 April 2026

What is CVE-2026-35523?

The Strawberry GraphQL library, used for building GraphQL APIs, is susceptible to an authentication bypass through its WebSocket subscription endpoints. Versions earlier than 0.312.3 lack proper validation in the legacy graphql-ws subprotocol handler, allowing unauthorized access. Attackers can bypass initial authentication by directly sending a start message, thus neglecting the required connection_init handshake. This exposes applications to potential unauthorized data access. The vulnerability has been addressed in version 0.312.3.

Affected Version(s)

strawberry < 0.312.3

References

https://github.com/strawberry-graphql/strawberry/security...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.