mcp-neo4j-cypher: SSRF and Data Modification via read_only Mode Bypass Through CALL Procedures
Priority LOW 12CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00264 18th percentileScored 2026-11-07
Fix Fixed mcp-neo4j (neo4j-contrib): 0.6.0mcp-neo4j-cypher (PyPI): 0.6.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| neo4j-contrib | mcp-neo4j | before 0.6.0 | 0.6.0 | Patch available | CNA |
| — | mcp-neo4j-cypher (PyPI) | before 0.6.0 | 0.6.0 | Patch available | GHSA-x3cv-r3g3-fpg9 |
- mcp-neo4j Vendorneo4j-contrib Affected before 0.6.0 Fixed in 0.6.0 Patch available CNA
- mcp-neo4j-cypher (PyPI) Vendor— Affected before 0.6.0 Fixed in 0.6.0 Patch available GHSA-x3cv-r3g3-fpg9
Remediation
- Fix · CNA mcp-neo4j (neo4j-contrib) Fixed in 0.6.0
- Fix · GHSA-x3cv-r3g3-fpg9 mcp-neo4j-cypher (PyPI) Fixed in 0.6.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-35402
- 2026-10-03 Alias added: GHSA-x3cv-r3g3-fpg9
References
Sources
- CVE-2026-35402 · CVE Program
- CVE-2026-35402 · NVD
- FIRST EPSS
- GHSA-x3cv-r3g3-fpg9 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences