What’s Vulnerable › Vulnerabilities
CVE-2026-35523: Authentication bypass in strawberry-graphql via legacy graphql-ws WebSocket subprotocol
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-07 · updated 2026-06-17
- Weakness: CWE-306
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.
Affected products
- strawberry-graphql strawberry: before 0.312.3 — fixed in 0.312.3
How to fix
Upgrade to a fixed version: strawberry-graphql strawberry 0.312.3. Check the vendor advisory for mitigations.
References
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