CVE-2026-5423
Subscription Authentication Bypass via Unverified connectionParams.jwt
Description
@neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users. Upgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix.
INFO
Published Date :
Aug. 6, 2026, 4:16 p.m.
Last Modified :
Aug. 6, 2026, 4:16 p.m.
Remotely Exploit :
Yes !
Source :
3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6
Affected Products
The following products are affected by CVE-2026-5423
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6 | ||||
| CVSS 4.0 | HIGH | 3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6 |
Solution
- Update @neo4j/graphql to version 7.5.6 or later.
- Update @neo4j/graphql to version 5.12.14 or later.
- Avoid using v6 as it is end-of-life.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-5423.
| URL | Resource |
|---|---|
| https://github.com/neo4j/graphql/security/advisories/GHSA-fcpg-3fw5-vc65 | |
| https://neo4j.com/security/CVE-2026-5423 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-5423 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-5423
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-5423 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-5423 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6
Aug. 06, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/neo4j/graphql', 'vendor': 'neo4j', 'product': 'graphql', 'versions': [{'status': 'affected', 'version': '7.0.0', 'lessThan': '7.5.6', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.0.0', 'lessThan': '5.12.14', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.0.0', 'versionType': 'semver', 'lessThanOrEqual': '6.6.4'}], 'packageName': '@neo4j/graphql', 'collectionURL': 'https://registry.npmjs.org', 'defaultStatus': 'unaffected'}] Added Description @neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users. Upgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-302 Added Reference https://github.com/neo4j/graphql/security/advisories/GHSA-fcpg-3fw5-vc65 Added Reference https://neo4j.com/security/CVE-2026-5423