Medium
Nginx UI: Auto backup name allows path traversal outside validated storage path
Type: advisorySources: OSV
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.3, Nginx UI validates an automatic backup's storage_path, but AutoBackup.GetName returns a user-controlled name without rejecting path separators or parent-directory components, and downstream filename formatting embeds that result in the final archive filename. An authenticated user who can create or modify an automatic backup can cause filepath.Join to resolve the generated archive path outside the validated storage directory, allowing backup archives to be written with the Nginx UI process privileges. For encrypted configuration backups, the adjacent encryption key file can also be written outside the validated directory. This issue is fixed in version 2.4.3.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-84320
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:13 UTC · Revision 1
Source evidence
Nginx UI: Auto backup name allows path traversal outside validated storage path
core-osv · Original sourcePublished 12 Oct 2026, 20:44 UTC
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.3, Nginx UI validates an automatic backup's storage_path, but AutoBackup.GetName returns a user-controlled name without rejecting path separators or parent-directory components, and downstream filename formatting embeds that result in the final archive filename. An authenticated user who can create or modify an automatic backup can cause filepath.Join to resolve the generated archive path outside the validated storage directory, allowing backup archives to be written with the Nginx UI process privileges. For encrypted configuration backups, the adjacent encryption key file can also be written outside the validated directory. This issue is fixed in version 2.4.3.
osv:CVE-2026-84320
Complete source record
{
"id": "f42c8381a86d21ec9263569cc403420345e7ab2c0ce9ab86938105cf6a330505",
"url": "https://osv.dev/vulnerability/CVE-2026-84320",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Nginx UI: Auto backup name allows path traversal outside validated storage path",
"summary": "Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.3, Nginx UI validates an automatic backup's storage_path, but AutoBackup.GetName returns a user-controlled name without rejecting path separators or parent-directory components, and downstream filename formatting embeds that result in the final archive filename. An authenticated user who can create or modify an automatic backup can cause filepath.Join to resolve the generated archive path outside the validated storage directory, allowing backup archives to be written with the Nginx UI process privileges. For encrypted configuration backups, the adjacent encryption key file can also be written outside the validated directory. This issue is fixed in version 2.4.3.",
"evidence": "osv:CVE-2026-84320",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-84320",
"aliases": [
"CVE-2026-84320",
"GHSA-jrq7-xrjx-pcfw",
"GO-2026-6788"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
}
],
"affected": [
{
"ranges": [
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"type": "GIT",
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{
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{
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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{
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"source": "REFERENCES_COMMIT"
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],
"modified": "2026-10-28T02:30:29.519622486Z",
"provider": "osv",
"references": [
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"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-jrq7-xrjx-pcfw",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84320.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-84320",
"https://github.com/0xJacky/nginx-ui/commit/f92218e01054491fc1e6684dc6f7facaf8ab41eb"
],
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}
},
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"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496271,
"published_at": "2026-10-12T20:44:39.471+00:00"
}