Apache Software Foundation · Apache Solr
Apache Solr (affected versions 6.0.0 through 8.11.2 and 9.0.0 before 9.4.1) contains a flaw in its ConfigSets and Backup APIs, where uploaded Java jar and class files can be written by backups to a directory that Solr loads into its ClassPath. An attacker with network access and low-privileged credentials, with no user interaction, can deploy executable code through a malicious ConfigSet, and this is more limited when Solr authorization is enabled, where the impact is restricted to gaining the ability to add libraries via backup permissions.
Improper Control of Dynamically-Managed Code Resources, Unrestricted Upload of File with Dangerous Type, Inclusion of Functionality from Untrusted Control Sphere 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. In the affected versions, Solr ConfigSets accepted Java jar and class files to be uploaded through the ConfigSets API. When backing up Solr Collections, these configSet files would be saved to disk when using the LocalFileSystemRepository (the default for backups). If the backup was saved to a directory that Solr uses in its ClassPath/ClassLoaders, then the jar and class files would be available to use with any ConfigSet, trusted or untrusted. When Solr is run in a secure way (Authorization enabled), as is strongly suggested, this vulnerability is limited to extending the Backup permissions with the ability to add libraries. Users are recommended to upgrade to version 8.11.3 or 9.4.1, which fix the issue. In these versions, the following protections have been added: * Users are no longer able to upload files to a configSet that could be executed via a Java ClassLoader. * The Backup API restricts saving backups to directories that are used in the ClassLoader.
First seen exploited 7 months after disclosure. Public exploit code (Metasploit) appeared 15 days after disclosure.
7 fixes in solr-core over 2 years. The latest fix listed for solr-core is 9.10.1.
No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
1 package in 1 ecosystem. Main package: org.apache.solr:solr-core.
Upgrade to 9.4.1
Fixes this CVE and 1 other known vulnerability in this package (CVE-2023-50290).
Still affected on this line by CVE-2026-44825 (no fix published).
Set the version to 9.4.1 or later in your pom.xml or build.gradle.
The first fix for CVE-2023-50386.
| If you run | Upgrade to |
|---|---|
| 9.0.0 up to 9.4.1 | 9.4.1 |
| 6.0.0 up to 8.11.3 | 8.11.3 |
“Up to” means the second version is the fix and is not affected.