CVE-2026-35523Network attack vector

Authentication bypass via skipped WebSocket initialization

Published Apr 7, 2026 · Updated Apr 7, 2026

Authentication bypass in Strawberry GraphQL before 0.312.3 allows remote attackers to access WebSocket subscriptions without authentication. The legacy graphql-ws handler processes a start message without confirming connection_init, so on_ws_connect never runs. Exposure requires an application that enables the legacy subprotocol and relies on on_ws_connect for authentication; affected integrations enable both WebSocket subprotocols by default.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Strawberry GraphQL before 0.312.3 allows remote attackers to access WebSocket subscriptions without authentication. The legacy graphql-ws handler processes a start message without confirming connection_init, so on_ws_connect never runs. Exposure requires an application that enables the legacy subprotocol and relies on on_ws_connect for authentication; affected integrations enable both WebSocket subprotocols by default.

The record

CVE
CVE-2026-35523
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Strawberry GraphQL
Product
Strawberry GraphQL
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.312.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Strawberry GraphQL · Strawberry GraphQLversion=< 0.312.3

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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