Bug 2495033 (CVE-2026-58371)

Summary: CVE-2026-58371 github.com/seaweedfs/seaweedfs: SeaweedFS: Information disclosure via unvalidated JSONP callback parameter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: aazores, cmah, eaguilar, ebaron, jolong, pjindal
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in SeaweedFS. This vulnerability allows a remote attacker to disclose sensitive information by exploiting an unvalidated JSONP (JavaScript Object Notation with Padding) callback parameter. The system reflects the callback parameter directly into responses without proper validation or security headers, enabling cross-origin loading of JSON endpoints. This can lead to the exposure of critical data such as cluster topology, server URLs, and directory listings to unauthorized third-party web pages.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-06-30 17:02:08 UTC 
SeaweedFS before 4.30 reflects the callback query parameter verbatim into responses served with Content-Type application/javascript in the shared writeJson helper (weed/server/common.go), with no callback-name validation, no X-Content-Type-Options: nosniff header, and no CORS allow-list. Every JSON endpoint that uses writeJson - including the unauthenticated master endpoints /dir/status, /dir/lookup and /cluster/status, the volume server /status, and the filer directory listing, all reachable in the default configuration (no -whiteList, no security.toml, bound to 0.0.0.0) - can therefore be loaded cross-origin via a script tag with a chosen callback, letting a third-party web page read cluster topology, volume server URLs and gRPC ports, file identifiers, and directory listings. Because the callback string is reflected at the start of the body and no nosniff header is sent, MIME-sniffing clients may also interpret the reflected content as HTML.