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CVE-2026-50022— Metacat acts as unintended proxy to backend Apache SOLR engine

Quick assessment

Affected
NCEAS metacat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Metacat 是一款数据仓库软件，旨在帮助研究人员保存、共享和发现数据。在 3.4.2 版本之前，Metacat 的 方法会将客户端可控的 参数，经由 Apache SolrJ 从诸如 等搜索端点转发至其具有较高权限的 Solr 后端。 未认证的客户端可以选择 处理器。即使在 Solr 7.0 及更高版本中配置了 ，SolrJ 仍会将该参数重新格式化为一个可被接受的请求。当 Solr 返回所选核心的配置文件时，Metacat 会将原始内容嵌入到 XML 解析错误响应中，从而泄露如 等内部文件，进而允许攻击者进行基

CVSS 5.8 · Medium
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I. Basic Information for CVE-2026-50022

Vulnerability Information
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Vulnerability Title
Metacat acts as unintended proxy to backend Apache SOLR engine
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
NCEAS metacat < 3.4.2 -

II. Public POCs for CVE-2026-50022

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III. Intelligence Information for CVE-2026-50022

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Patches & Fixes for CVE-2026-50022 (2)

Vendor Advisories for CVE-2026-50022 (1)

Vendor Pages for CVE-2026-50022 (1)

IV. Related Vulnerabilities

Same product: metacat
Same vendor: NCEAS
Same weakness: CWE-441

V. Comments for CVE-2026-50022

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