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CVE-2026-5423— Subscription Authentication Bypass via Unverified connectionParams.jwt

Quick assessment

Affected
neo4j graphql
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Neo4j graphql是美国Neo4j公司的一款一种数据查询与操作语言。 Neo4j graphql 7.5.6之前版本、5.12.14之前版本和6.6.4及之前版本存在授权问题漏洞，该漏洞源于未验证客户端提供的预解码JWT对象真实性，可能导致未经身份验证的远程攻击者伪造JWT声明，绕过身份验证，接收受限制的订阅事件。

CVSS 8.2 · High EPSS 0.59% · P46

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 3

VendorProduct Version RangeStatus
neo4j graphql 7.0.0< 7.5.6 affected
5.0.0< 5.12.14 affected
6.0.0≤ 6.6.4 affected
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I. Basic Information for CVE-2026-5423

Vulnerability Information
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Vulnerability Title
Subscription Authentication Bypass via Unverified connectionParams.jwt
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用假设不可变数据进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Neo4j graphql 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Neo4j graphql是美国Neo4j公司的一款一种数据查询与操作语言。 Neo4j graphql 7.5.6之前版本、5.12.14之前版本和6.6.4及之前版本存在授权问题漏洞，该漏洞源于未验证客户端提供的预解码JWT对象真实性，可能导致未经身份验证的远程攻击者伪造JWT声明，绕过身份验证，接收受限制的订阅事件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
neo4j graphql 7.0.0 ~ 7.5.6 -

II. Public POCs for CVE-2026-5423

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10032 chars
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III. Intelligence Information for CVE-2026-5423

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Vendor Advisories for CVE-2026-5423 (1)

Other References for CVE-2026-5423 (1)

IV. Related Vulnerabilities

Same product: graphql
Same vendor: neo4j
Same weakness: CWE-302

V. Comments for CVE-2026-5423

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