CVE-2026-35402 json
mcp-neo4j-cypher: SSRF and Data Modification via read_only Mode Bypass Through CALL Procedures
published 2026-04-17 6 mo ago modified 2026-07-13 3 mo ago also GHSA-x3cv-r3g3-fpg9 , PYSEC-2026-2626 , EUVD-2026-23518
- cvss
- 2.3
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
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.
Patch / fix
- pypi mcp-neo4j-cypher 0.6.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 2.3 | 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 |
| CNA | 4.0 | 2.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | mcp-neo4j-cypher | <0.6.0 |
0.6.0 |
Affected products
- neo4j-contrib mcp-neo4j
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
-
github.com
/neo4j-contrib/mcp-neo4j/security/advisories/GHSA-x3cv-r3g3-fpg9
web
-
github.com
/neo4j-contrib/mcp-neo4j/releases/tag/mcp-neo4j-cypher-v0.6.0
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-35402
advisory
-
github.com
/neo4j-contrib/mcp-neo4j
package
-
pypi.org
/project/mcp-neo4j-cypher
package
-
github.com
/advisories/GHSA-x3cv-r3g3-fpg9
advisory
Sources
- CVE List CVE-2026-35402
- GitHub Advisory GHSA-x3cv-r3g3-fpg9
- NVD CVE-2026-35402
- OSV PYSEC-2026-2626
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