CVE-2026-35402: CWE-284: Improper Access Control in neo4j-contrib mcp-neo4j
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.
AI Analysis
Technical Summary
The mcp-neo4j-cypher server, used for executing Cypher queries against Neo4j databases, has an access control weakness in versions before 0.6.0. Specifically, the read_only mode intended to restrict write operations can be circumvented by leveraging APOC CALL procedures. This bypass potentially enables unauthorized modification of data or server-side request forgery attacks. The vulnerability is tracked as CWE-284 (Improper Access Control) and has a CVSS 4.0 base score of 2.3, indicating low severity. The fix is implemented in version 0.6.0 of mcp-neo4j.
Potential Impact
Exploitation of this vulnerability could allow an attacker with limited privileges to perform unauthorized write operations on the Neo4j database or conduct server-side request forgery. However, the overall impact is considered low severity due to the required privileges and limited scope of the bypass. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade mcp-neo4j to version 0.6.0 or later, where this access control bypass issue is fixed. Since no official patch link or advisory is provided, verify the upgrade from the vendor's official release notes or repository. Patch status is not explicitly confirmed beyond the fix in version 0.6.0, so check vendor sources for the latest remediation guidance.
CVE-2026-35402: CWE-284: Improper Access Control in neo4j-contrib mcp-neo4j
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 v4.0
Score 2.3low
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The mcp-neo4j-cypher server, used for executing Cypher queries against Neo4j databases, has an access control weakness in versions before 0.6.0. Specifically, the read_only mode intended to restrict write operations can be circumvented by leveraging APOC CALL procedures. This bypass potentially enables unauthorized modification of data or server-side request forgery attacks. The vulnerability is tracked as CWE-284 (Improper Access Control) and has a CVSS 4.0 base score of 2.3, indicating low severity. The fix is implemented in version 0.6.0 of mcp-neo4j.
Potential Impact
Exploitation of this vulnerability could allow an attacker with limited privileges to perform unauthorized write operations on the Neo4j database or conduct server-side request forgery. However, the overall impact is considered low severity due to the required privileges and limited scope of the bypass. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade mcp-neo4j to version 0.6.0 or later, where this access control bypass issue is fixed. Since no official patch link or advisory is provided, verify the upgrade from the vendor's official release notes or repository. Patch status is not explicitly confirmed beyond the fix in version 0.6.0, so check vendor sources for the latest remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-02T17:03:42.074Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e29db8bdfbbecc598ee1b8
Added to database: 4/17/2026, 8:53:12 PM
Last enriched: 4/25/2026, 2:53:30 AM
Last updated: 6/2/2026, 10:45:48 AM
Views: 91
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