CVE-2026-35402

Received Received - Intake

Bypass of Read-Only Enforcement via APOC in mcp-neo4j-cypher

Publication date: 2026-04-17

Last updated on: 2026-04-17

Assigner: GitHub, Inc.

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.

CVSS Scores

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Meta Information

Published

2026-04-17

Last Modified

2026-04-17

Generated

2026-07-06

AI Q&A

2026-04-18

EPSS Evaluated

2026-07-05

NVD

CVE-2026-35402

EUVD

EUVD-2026-23518

Affected Vendors & Products

Vendor	Product	Version / Range
neo4j	mcpc-neo4j-cypher	to 0.6.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

The vulnerability exists in mcp-neo4j-cypher, an MCP server used to execute Cypher queries on Neo4j databases. In versions before 0.6.0, the enforcement of read_only mode can be bypassed by using APOC CALL procedures. This bypass allows unauthorized write operations or server-side request forgery, meaning attackers could perform actions that should be restricted.

Impact Analysis

This vulnerability can impact you by allowing unauthorized write operations on your Neo4j database through the MCP server. It could also enable server-side request forgery, potentially leading to further exploitation or unauthorized access to internal resources. Essentially, it compromises the integrity and security of your database operations.

Mitigation Strategies

To mitigate this vulnerability, upgrade mcp-neo4j-cypher to version 0.6.0 or later, where the read_only mode enforcement bypass issue is fixed.

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