What is CVE-2026-50022?

CVE-2026-50022 is a medium-severity vulnerability in Nceas Metacat, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 5.8/10. Published 2026-09-17.

How severe is CVE-2026-50022?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Vulnerability in Nceas Metacat

CVE-2026-50022

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.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.

Affected products

Nceas Metacat — versions < 3.4.2

Weakness classification (CWE)

CWE-441 — Unintended Proxy or Intermediary (Confused Deputy)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-50022?: CVE-2026-50022 is a medium-severity vulnerability in Nceas Metacat, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 5.8/10. Published 2026-09-17.
How severe is CVE-2026-50022?: Medium severity. CVSS v3 base score is 5.8 out of 10.