Neo4j Labs MCP Servers: SSRF and Data Modification via read_only Mode Bypass Through CALL Procedures
Summary
The read_only mode in mcp-neo4j-cypher versions prior to 0.6.0 can be bypassed using CALL procedures.
Details
Impact
The enforcing of read_only mode in vulnerable versions could be bypassed by certain APOC procedures.
Patches
v0.6.0 release hardened the checks around the mode. The only way to guarantee the server actions is to limit the permissions of the db credentials available to the server.
Notes
Impacts for server-side request forgery vulnerabilities may depend on both the configuration of the vulnerable system as well as the presence of other systems in the environment that could be accessed as part of exploitation.
Recommended hardening
- Limit the apoc procedures to what's required
- Manage data loading privileges
- Don't relax the default settings without compensating controls
apoc.import.file.enabledisfalseby defaultapoc.import.file.use_neo4j_configistrueby default to restrict file imports to the import folder
Credits
We want to publicly recognise the contribution of Yotam Perkal from Pluto Security.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | mcp-neo4j-cypher | < 0.6.0 | 0.6.0 |
Referencias
- https://github.com/neo4j-contrib/mcp-neo4j/security/advisories/GHSA-x3cv-r3g3-fpg9
- https://nvd.nist.gov/vuln/detail/CVE-2026-35402
- https://github.com/neo4j-contrib/mcp-neo4j
- https://github.com/neo4j-contrib/mcp-neo4j/releases/tag/mcp-neo4j-cypher-v0.6.0
- https://pypi.org/project/mcp-neo4j-cypher
- https://github.com/advisories/GHSA-x3cv-r3g3-fpg9
- Vector CVSS
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- Debilidad (CWE)
CWE-284- Plataforma
- Python (PyPI)
- Paquete
mcp-neo4j-cypher- Publicada
- 17.04.2026
- Actualizado
- 11.10.2026 14:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-2626 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-x3cv-r3g3-fpg9 - CC BY 4.0
Historial de vulnerabilidades: mcp-neo4j-cypher
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 09.2025 04.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 1
- Baja 1
Divulgaciones por año
- 2025: 1
- 2026: 1
-
Neo4j Labs MCP Servers: SSRF and Data Modification via read_only Mode Bypass Through CALL Procedures esta entrada
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