CVE-2026-50022

MEDIUM 5.8

Metacat acts as unintended proxy to backend Apache SOLR engine

CVSS Score

5.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-441
Vendor	nceas
Product	metacat
Published	Sep 17, 2026
Last Updated	Sep 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

NCEAS / metacat

< 3.4.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/NCEAS/metacat/security/advisories/GHSA-57g5-qq6w-7jr8 github.com: https://github.com/NCEAS/metacat/pull/2319 github.com: https://github.com/NCEAS/metacat/commit/d500306188881d768b93f189bb8ddbf090f3f1ec github.com: https://github.com/NCEAS/metacat/releases/tag/3.4.2