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CVE-2026-22444 Apache Solr

Affected softwareApache Solr
Severity7.1 High CVSS 3.1
Fixed in9.10.1
WeaknessImproper input validation (CWE-20)
Published21 Jan 2026
Updated17 Jun 2026

Description

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.  Solr deployments are subject to this vulnerability if they meet the following criteria: * Solr is running in its "standalone" mode. * Solr's "allowPath" setting is being used to restrict file access to certain directories. * 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. Users 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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 2 repositories below are public GitHub repositories with fewer than 5 stars.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 2 indexed, none at 5+ stars
  • EPSS 0.69% chance in 30 days

2 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC CVE-2026-22444 是一个影响 Apache Solr 的安全漏洞,于 2026 年 1 月 20 日左右公开披露。该漏洞源于 Apache Solr 的 "create core" API 在某些 API 参数上的输入验证不足(CWE-20: Improper Input Validation),允许攻击者在 Solr 运行于 "standalone" 模式时绕过安全规则,可能导致数据泄露、远程代码执行 (RCE) 或 NTLM 哈希披露。 2026-01-23
GitHub PoC PoC for CVE-2026-22444: Apache Solr 8.6-9.10.0 Windows standalone mode RCE/NTLM hash disclosure 2026-01-22

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2026 ↗ CPU 2026-Q2 Oracle Communications / Core (Apache Solr) (6.1.1-7.0.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Core (Apache Solr) 6.1.1-7.0.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.solr:solr-core 8.6.0 9.10.1 unbounded

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
nvd apache solr generic ≥ 8.6.0 and < 9.10.1
osv org.apache.solr solr-core generic ≥ 8.6.0 and < 9.10.1

References

URLTags
https://github.com/apache/solr PACKAGE
https://issues.apache.org/jira/browse/SOLR-18058 WEB
https://lists.apache.org/thread/qkrb9dd4xrlqmmq73lrhkbfkttto2d1m WEB
http://www.openwall.com/lists/oss-security/2026/01/20/5 WEB

Timeline

Published2026-01-21By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.