Medium
Copyparty volflag `nohtml` did not block javascript in svg files
Type: advisorySources: OSV
Copyparty is a portable file server. Prior to v1.20.11., the nohtml config option, intended to prevent execution of JavaScript in user-uploaded HTML files, did not apply to SVG images. A user with write-permission could upload an SVG containing embedded JavaScript, which would execute in the context of whichever user opens it. This has been fixed in v1.20.11.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-30974
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:50 UTC · Revision 1
Source evidence
Copyparty volflag `nohtml` did not block javascript in svg files
core-osv · Original sourcePublished 10 Mar 2026, 17:37 UTC
Copyparty is a portable file server. Prior to v1.20.11., the nohtml config option, intended to prevent execution of JavaScript in user-uploaded HTML files, did not apply to SVG images. A user with write-permission could upload an SVG containing embedded JavaScript, which would execute in the context of whichever user opens it. This has been fixed in v1.20.11.
osv:CVE-2026-30974
Complete source record
{
"id": "4bfdad7322beec11b8e5f997e84a405ba7b176fe45e780b24ea972ce9169fcf7",
"url": "https://osv.dev/vulnerability/CVE-2026-30974",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Copyparty volflag `nohtml` did not block javascript in svg files",
"summary": "Copyparty is a portable file server. Prior to v1.20.11., the nohtml config option, intended to prevent execution of JavaScript in user-uploaded HTML files, did not apply to SVG images. A user with write-permission could upload an SVG containing embedded JavaScript, which would execute in the context of whichever user opens it. This has been fixed in v1.20.11.",
"evidence": "osv:CVE-2026-30974",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-30974",
"aliases": [
"CVE-2026-30974",
"GHSA-m6hv-x64c-27mm",
"PYSEC-2026-2137"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/9001/copyparty",
"type": "GIT",
"events": [
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},
{
"fixed": "eca3ced16065caea36767b55354815ab12f1a28b"
},
{
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],
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{
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"range": [
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{
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"source": "CPE_RANGE"
},
{
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"source": "REFERENCES_COMMIT"
},
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30974.json"
}
}
],
"modified": "2026-10-28T02:30:29.694026081Z",
"provider": "osv",
"references": [
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"https://github.com/9001/copyparty/security/advisories/GHSA-m6hv-x64c-27mm",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30974.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-30974",
"https://github.com/9001/copyparty/commit/1c9f894e149b6be3cc7de81efc93a4ce4766e0e5"
],
"provider_metadata": {
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30974.json"
}
},
"related_cves": [
{
"value": "CVE-2026-30974",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496548,
"published_at": "2026-03-10T17:37:26.214+00:00"
}