CVE-2026-50022 Metacat acts as unintended proxy to backend Apache SOLR engine
Unauthenticated attackers can exploit Metacat to proxy requests to the backend Solr engine, disclosing internal configuration files and enabling infrastructure profiling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-50022?
CVE-2026-50022 is a medium-severity server-side request forgery vulnerability in NCEAS metacat, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-441
Which versions are affected by CVE-2026-50022?
How do I fix CVE-2026-50022?
No fix has been published for CVE-2026-50022 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-50022 being exploited?
There is no known exploitation of CVE-2026-50022 in the wild and no public exploit code.
Sources
Also known as GHSA-57g5-qq6w-7jr8.