CVE-2026-35402 | neo4j-contrib mcp-neo4j up to 0.5.x APOC CALL read_only access control (GHSA-x3cv-r3g3-fpg9)

VDB-358130 · CVE-2026-35402 · GHSA-X3CV-R3G3-FPG9 NEO4J-CONTRIB MCP-NEO4J UP TO 0.5.X APOC CALL READ_ONLY ACCESS CONTROL HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 2.44+ Summaryinfo A vulnerability labeled as critical has been found in neo4j-contrib mcp-neo4j up to 0.5.x. This vulnerability affects the function read_only of the component APOC CALL Handler. Such manipulation leads to access control. This vulnerability is referenced as CVE-2026-35402. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded. Detailsinfo A vulnerability, which was classified as critical, has been found in neo4j-contrib mcp-neo4j up to 0.5.x. Affected by this issue is the function read_only of the component APOC CALL Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. CVE summarizes: 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. The advisory is available at github.com. This vulnerability is handled as CVE-2026-35402 since 04/02/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project. Upgrading to version 0.6.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Productinfo Type Artificial Intelligence Software Vendor neo4j-contrib Name mcp-neo4j Version 0.1 0.2 0.3 0.4 0.5 Website Product: https://github.com/neo4j-contrib/mcp-neo4j/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Access control CWE: CWE-284 / CWE-266 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: mcp-neo4j 0.6.0 Timelineinfo 04/02/2026 CVE reserved 04/17/2026 +15 days Advisory disclosed 04/17/2026 +0 days VulDB entry created 04/17/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-x3cv-r3g3-fpg9 Status: Confirmed CVE: CVE-2026-35402 (🔒) GCVE (CVE): GCVE-0-2026-35402 GCVE (VulDB): GCVE-100-358130 Entryinfo Created: 04/17/2026 23:51 Changes: 04/17/2026 23:51 (71) Complete: 🔍 Cache ID: 99:902:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸