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CVE-2026-35402— mcp-neo4j-cypher: SSRF and Data Modification via read_only Mode Bypass Through CALL Procedures

Quick assessment

Affected
neo4j-contrib mcp-neo4j
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Neo4j MCP Clients & Servers是Neo4j Contrib开源的一个用于管理大语言模型上下文的协议。 Neo4j MCP Clients & Servers 0.6.0之前版本存在安全漏洞，该漏洞源于只读模式可通过APOC CALL过程绕过，可能导致未授权的写入操作或服务器端请求伪造。

AI Predicted 8.1 Difficulty: Easy EPSS 0.39% · P31
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I. Basic Information for CVE-2026-35402

Vulnerability Information
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Vulnerability Title
mcp-neo4j-cypher: SSRF and Data Modification via read_only Mode Bypass Through CALL Procedures
Source: CVE Program / CVE List V5
Vulnerability Description
mcp-neo4j-cypher is an MCP server for executing Cypher queries against Neo4j databases. In versions prior to 0.6.0, the read_only mode enforcement can be bypassed using APOC CALL procedures, potentially allowing unauthorized write operations or server-side request forgery. This issue is fixed in version 0.6.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Neo4j MCP Clients & Servers 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Neo4j MCP Clients & Servers是Neo4j Contrib开源的一个用于管理大语言模型上下文的协议。 Neo4j MCP Clients & Servers 0.6.0之前版本存在安全漏洞，该漏洞源于只读模式可通过APOC CALL过程绕过，可能导致未授权的写入操作或服务器端请求伪造。
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-contrib mcp-neo4j < 0.6.0 -

II. Public POCs for CVE-2026-35402

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III. Intelligence Information for CVE-2026-35402

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IV. Related Vulnerabilities

Same vendor: neo4j-contrib
Same weakness: CWE-284

V. Comments for CVE-2026-35402

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