CVE-2026-50022 json
Metacat acts as unintended proxy to backend Apache SOLR engine
published 5mo ago modified last mo. also EUVD-2026-82417 , GHSA-57g5-qq6w-7jr8
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository NCEAS/metacat. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 5.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- github.com/NCEAS/metacat@d500306 commit
- github.com/NCEAS/metacat#2319 pull request
- github.com/NCEAS/metacat/releases/tag/3.4.2 release
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- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N |
Affected products
- NCEAS metacat
Classification
- Weakness
-
- CWE-441 Unintended Proxy or Intermediary
References
Sources
- CVE List CVE-2026-50022
- NVD CVE-2026-50022
- Maintainer advisory GHSA-57g5-qq6w-7jr8
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of NCEAS/metacat published their own advisory on GitHub. Reviewed sources take precedence over it.