Apache Solr's Streaming Expressions allow users to extract data from other Solr Clouds

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.9 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P · score source

EPSS

• CVE-2023-50298: 1.56% estimated exploitation activity in the next 30 days; percentile 75.32 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache Solr. This issue affects Apache Solr from 6.0.0 through 8.11.2, from 9.0.0 before 9.4.1. Solr Streaming Expressions allows users to extract data from other Solr Clouds, using a "zkHost" parameter. When original SolrCloud is setup to use ZooKeeper credentials and ACLs, they will be sent to whatever "zkHost" the user provides. An attacker could setup a server to mock ZooKeeper, that accepts ZooKeeper requests with credentials and ACLs and extracts the sensitive information, then send a streaming expression using the mock server's address in "zkHost". Streaming Expressions are exposed via the "/streaming" handler, with "read" permissions. Users are recommended to upgrade to version 8.11.3 or 9.4.1, which fix the issue. From these versions on, only zkHost values that have the same server address (regardless of chroot), will use the given ZooKeeper credentials and ACLs when connecting.

Published by the source

9 Feb 2024, 18:31 UTC

Last modified by the source

19 Aug 2024, 20:48 UTC

Source last checked

26 Oct 2026, 16:30 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-xrj7-x7gp-wwqr

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# Patch Next advisory brief: CVE-2023-50298

Advisory: Apache Solr's Streaming Expressions allow users to extract data from other Solr Clouds
IDs: CVE-2023-50298, GHSA-xrj7-x7gp-wwqr
Record: https://patchnext.com/advisories/cve-2023-50298 (revision 1, source checked 26 Oct 2026, 16:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.apache.solr:solr-solrj-streaming 9.4.1, 8.11.3; org.apache.solr:solr-solrj 9.4.1, 8.11.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.solr:solr-solrj-streaming: affected >= 9.0.0, < 9.4.1; >= 6.0.0, < 8.11.3; fixed in 8.11.3, 9.4.1
- Maven org.apache.solr:solr-solrj: affected >= 9.0.0, < 9.4.1; >= 6.0.0, < 8.11.3; fixed in 8.11.3, 9.4.1

## Suggested inspection (read-only)
- Maven org.apache.solr:solr-solrj-streaming: check the installed version with your package manager.
- Maven org.apache.solr:solr-solrj: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.solr:solr-solrj-streaming, org.apache.solr:solr-solrj.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-xrj7-x7gp-wwqr (GitHub-reviewed advisory GHSA-xrj7-x7gp-wwqr lists affected ranges: Maven org.apache.solr:solr-solrj-streaming >=9.0.0 =6.0.0 =9.0.0 =6.0.0 <8.11.3)

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