CVE-2026-35402: Neo4j Labs MCP Servers: SSRF and Data Modification via read_only Mode Bypass Through CALL Procedures

April 17, 2026 (updated April 24, 2026)

The read_only mode in mcp-neo4j-cypher versions prior to 0.6.0 can be bypassed using CALL procedures.

References

github.com/advisories/GHSA-x3cv-r3g3-fpg9
github.com/neo4j-contrib/mcp-neo4j
github.com/neo4j-contrib/mcp-neo4j/releases/tag/mcp-neo4j-cypher-v0.6.0
github.com/neo4j-contrib/mcp-neo4j/security/advisories/GHSA-x3cv-r3g3-fpg9
nvd.nist.gov/vuln/detail/CVE-2026-35402

Code Behaviors & Features

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