SeaweedFS < 4.30 - Cross-Origin Information Disclosure via Unvalidated JSONP callback Parameter
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-58371
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 08:36 UTC · Revision 1
Source evidence
SeaweedFS < 4.30 - Cross-Origin Information Disclosure via Unvalidated JSONP callback Parameter
core-osv · Original sourcePublished 30 Jun 2026, 15:57 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.
osv:CVE-2026-58371
Complete source record
{
"id": "d3828ae68c429561dc235e596aaa884608d3b171e29ce7433491d0a6b0730730",
"url": "https://osv.dev/vulnerability/CVE-2026-58371",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "SeaweedFS < 4.30 - Cross-Origin Information Disclosure via Unvalidated JSONP callback Parameter",
"summary": "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.",
"evidence": "osv:CVE-2026-58371",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-58371",
"aliases": [
"BIT-seaweedfs-2026-58371",
"CVE-2026-58371"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/seaweedfs/seaweedfs",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "34be9170f0d461bd16ec7458fff106f277c0eb75"
},
{
"fixed": "77dcb20a7485074d37340985d53103f94538abe6"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "4.30"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"fixed": "34be9170f0d461bd16ec7458fff106f277c0eb75"
}
],
"source": "REFERENCES_TAG",
"original_tag": "4.30"
},
{
"range": [
{
"fixed": "77dcb20a7485074d37340985d53103f94538abe6"
}
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"source": "REFERENCES_COMMIT"
}
]
}
}
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58371.json"
}
}
],
"modified": "2026-10-28T02:30:27.244468442Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58371.json",
"https://github.com/seaweedfs/seaweedfs/releases/tag/4.30",
"https://nvd.nist.gov/vuln/detail/CVE-2026-58371",
"https://www.vulncheck.com/advisories/seaweedfs-cross-origin-information-disclosure-via-unvalidated-jsonp-callback-parameter",
"https://github.com/seaweedfs/seaweedfs/pull/9686",
"https://github.com/seaweedfs/seaweedfs/commit/77dcb20a7485074d37340985d53103f94538abe6",
"https://github.com/seaweedfs/seaweedfs",
"https://github.com/geo-chen/oss/blob/main/seaweedfs.md"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58371.json"
}
},
"related_cves": [
{
"value": "CVE-2026-58371",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493872,
"published_at": "2026-06-30T15:57:36.585+00:00"
}