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Metacat EUVDEUVD-2026-82417

| CVE-2026-50022 MEDIUM
Unintended Proxy or Intermediary ('Confused Deputy') (CWE-441)
2026-09-17 GitHub_M
Apache Java Information Disclosure Metacat
5.8
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
5.8 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
vuln.today AI
5.8 MEDIUM

Unauthenticated network request (AV:N/PR:N/UI:N), Metacat is a confused deputy reaching a separate privileged Solr backend (S:C), and only config metadata is disclosed (C:L, I:N/A:N).

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

4
Metadata Corrected
Sep 17, 2026 - 21:40 vuln.today
tag: Java added
Analysis Generated
Sep 17, 2026 - 21:37 vuln.today
Patch available
Sep 17, 2026 - 21:19 EUVD
CVE Published
Sep 17, 2026 - 20:06 cve.org
MEDIUM 5.8

DescriptionCVE.org

Metacat is data repository software that helps researchers preserve, share, and discover data. Prior to 3.4.2, MetacatSolrIndex.query forwards the client-controlled qt parameter through Apache SolrJ from search endpoints such as /d1/mn/v2/query/solr/ to its privileged Solr backend. An unauthenticated client can select the /admin/file handler, and SolrJ reformats the parameter into a request accepted even when handleSelect=false is configured on Solr 7.0 or later. When Solr returns the selected core configuration file, Metacat embeds the raw content in an XML processing error response, disclosing internal files such as solrconfig.xml and enabling infrastructure profiling. This issue is fixed in version 3.4.2.

AnalysisAI

Unauthenticated information disclosure in NCEAS Metacat versions prior to 3.4.2 allows remote attackers to retrieve internal Apache Solr configuration files such as solrconfig.xml through the client-controlled 'qt' parameter. Because Metacat forwards requests from search endpoints like /d1/mn/v2/query/solr/ to its privileged Solr backend via SolrJ, an attacker can force the /admin/file handler to run even against Solr 7.0+ installations configured with handleSelect=false, and the returned file contents are reflected in an XML error response. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Requires a Metacat instance older than 3.4.2 whose search endpoints (e.g. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but moderate-severity issue, correctly rated 5.8. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Metacat to 3.4.2 or later - the release tagged https://github.com/NCEAS/metacat/releases/tag/3.4.2, which incorporates the fix from pull request https://github.com/NCEAS/metacat/pull/2319 (commit d500306188881d768b93f189bb8ddbf090f3f1ec). … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-82417 vulnerability details – vuln.today
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