CVE-2026-22444: Apache Solr Insufficient File-access Checking Vulnerability
HIGHCVE-2026-22444 is a HIGH (CVSS 7.1) insufficient file-access checking vulnerability (CWE-20: Improper Input Validation) affecting Apache Solr libraries in the Maven ecosystem. The issue involves insufficient file-access checking in standalone core-creation requests. Remediation is available by upgrading affected packages to version 9.10.1.
CVE-2026-22444 at a Glance
Security Impact
CVSS: 7.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N).
How to Fix CVE-2026-22444
To remediate this vulnerability, upgrade all affected Apache Solr dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.apache.solr</groupId>
<artifactId>solr-core</artifactId>
<version>9.10.1</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.apache.solrHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-22444, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.apache.solrAnalyze the terminal output to locate any version of Apache Solr in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.10.1), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.apache.solr command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Apache Solr, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-22444 Affected Apache Solr Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.apache.solr:solr-core
|
Maven |
≥ 8.6.0
< 9.10.1
|
9.10.1
|
References
Frequently Asked Questions
What is CVE-2026-22444?
Which Apache Solr versions are affected?
What version fixes CVE-2026-22444?
Is solr-core affected?
What is the CVSS score of CVE-2026-22444?
What CWE is associated with CVE-2026-22444?
How can I check Maven dependencies for CVE-2026-22444?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-vc2w-4v3p-2mqw",
"modified" : "2026-01-21T22:57:58Z",
"published" : "2026-01-21T15:31:16Z",
"aliases" : [ "CVE-2026-22444" ],
"summary" : "Apache Solr: Insufficient file-access checking in standalone core-creation requests",
"details" : "The \"create core\" API of Apache Solr 8.6 through 9.10.0 lacks sufficient input validation on some API parameters, which can cause Solr to check the existence of and attempt to read file-system paths that should be disallowed by Solr's \"allowPaths\" security setting https://https://solr.apache.org/guide/solr/latest/configuration-guide/configuring-solr-xml.html#the-solr-element . These read-only accesses can allow users to create cores using unexpected configsets if any are accessible via the filesystem. On Windows systems configured to allow UNC paths this can additionally cause disclosure of NTLM \"user\" hashes. \n\nSolr deployments are subject to this vulnerability if they meet the following criteria:\n * Solr is running in its \"standalone\" mode.\n * Solr's \"allowPath\" setting is being used to restrict file access to certain directories.\n * Solr's \"create core\" API is exposed and accessible to untrusted users. This can happen if Solr's RuleBasedAuthorizationPlugin https://solr.apache.org/guide/solr/latest/deployment-guide/rule-based-authorization-plugin.html is disabled, or if it is enabled but the \"core-admin-edit\" predefined permission (or an equivalent custom permission) is given to low-trust (i.e. non-admin) user roles.\n\nUsers can mitigate this by enabling Solr's RuleBasedAuthorizationPlugin (if disabled) and configuring a permission-list that prevents untrusted users from creating new Solr cores. Users should also upgrade to Apache Solr 9.10.1 or greater, which contain fixes for this issue.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.apache.solr:solr-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "8.6.0"
}, {
"fixed" : "9.10.1"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-22444"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/apache/solr"
}, {
"type" : "WEB",
"url" : "https://issues.apache.org/jira/browse/SOLR-18058"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread/qkrb9dd4xrlqmmq73lrhkbfkttto2d1m"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2026/01/20/5"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-20" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-01-21T22:57:58Z",
"nvd_published_at" : "2026-01-21T14:16:06Z"
}
}