Unauthenticated subscription access via unverified JWT claims
Published Aug 6, 2026 · Updated Aug 6, 2026
Authentication bypass in Neo4j GraphQL Library allows remote attackers to read restricted GraphQL subscription events. The subscription context accepts a client-supplied, pre-decoded connectionParams.jwt object as authenticated claims without verifying its signature or authenticity. Exploitation requires enabled subscription and authorization features plus WebSocket connection parameters forwarded into resolver context; it exposes event data but does not modify or interrupt the underlying database.
Summary
What happened
Authentication bypass in Neo4j GraphQL Library allows remote attackers to read restricted GraphQL subscription events. The subscription context accepts a client-supplied, pre-decoded connectionParams.jwt object as authenticated claims without verifying its signature or authenticity. Exploitation requires enabled subscription and authorization features plus WebSocket connection parameters forwarded into resolver context; it exposes event data but does not modify or interrupt the underlying database.
The record
- CVE
- CVE-2026-5423
- Published
- Aug 6, 2026
- Updated
- Aug 6, 2026
- Vendor
- Neo4j
- Product
- Neo4j GraphQL Library
- Classifications
- CWE-302, CAPEC-115, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 6, 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?
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- Affected versionversion=5.0.0 <5.12.14
- Affected versionversion=6.0.0 <=6.6.4
- Affected versionversion=7.0.0 <7.5.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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