Medium
Security advisory
A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-8294
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:34 UTC · Revision 1
Source evidence
A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.
osv:CVE-2020-8294
Complete source record
{
"id": "a3e2cef22383b2685b8230488ae80e1409ed22c2f6f7cdd0ff1c5c0e5022750a",
"url": "https://osv.dev/vulnerability/CVE-2020-8294",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-8294",
"summary": "A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.",
"evidence": "osv:CVE-2020-8294",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-8294",
"aliases": [
"CVE-2020-8294"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nextcloud/server",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "148e875f8edbf2f66d1f9a5d1a13ececc5b4da4d"
},
{
"introduced": "9c63433cde916cd35b0708b398910cbc1cb52315"
},
{
"fixed": "666ad85b63cf29f10377188992774c57b9d1e69f"
},
{
"introduced": "615b994816710a595243d704c9be445f736b4b41"
},
{
"fixed": "96f99a40f5569936f1951f1ccef8ea5fa25b607b"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "18.0.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "19.0.0"
},
{
"fixed": "19.0.5"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "20.0.0"
},
{
"fixed": "20.0.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v18.0.11RC2",
"v19.0.5RC2",
"v20.0.2RC2",
"v19.0.5RC1",
"v20.0.2RC1",
"v18.0.11RC1",
"v20.0.1",
"v20.0.1RC1",
"v18.0.10",
"v19.0.4",
"v18.0.10RC2",
"v19.0.4RC2",
"v20.0.0",
"v18.0.10RC1",
"v19.0.40RC1",
"v18.0.9",
"v19.0.3",
"v18.0.9RC1",
"v19.0.3RC1",
"v18.0.8",
"v19.0.2",
"v18.0.8RC2",
"v19.0.2RC2",
"v19.0.2RC1",
"v18.0.8RC1",
"v18.0.7",
"v19.0.1",
"v18.0.7RC1",
"v19.0.1RC1",
"v18.0.6",
"v18.0.5",
"v17.0.5RC1",
"v19.0.0",
"v18.0.4",
"v18.0.4RC2",
"v18.0.4RC1",
"v18.0.2",
"v18.0.2RC2",
"v18.0.2RC1",
"v18.0.1",
"v18.0.1RC3",
"v18.0.1RC2",
"v18.0.1RC1",
"v18.0.0",
"v18.0.0RC2",
"v18.0.0RC1",
"v18.0.0beta4",
"v18.0.0beta3",
"v18.0.0beta2",
"v18.0.0beta1",
"v17.0.0beta4",
"v17.0.0beta3",
"v17.0.0beta2",
"v17.0.0beta1",
"v16.0.0RC1",
"v16.0.0beta3",
"v16.0.0beta2",
"v16.0.0beta1",
"v16.0.0alpha1",
"v15.0.0RC1",
"v15.0.0beta2",
"v15.0.0beta1",
"v14.0.0RC2",
"v14.0.0RC1",
"v14.0.0beta4",
"v14.0.0beta3",
"v14.0.0beta2",
"v14.0.0beta1",
"v13.0.0RC1",
"v13.0.0beta4",
"v13.0.0beta3",
"v13.0.0beta2",
"v13.0.0beta1",
"v12.0.0beta4",
"v12.0.0beta3",
"v12.0.0beta2",
"v12.0.0beta1",
"v11.0.0",
"v11.0RC2",
"v9.1.0beta1",
"v9.0.0beta2",
"v9.0beta1",
"v8.2RC1",
"v8.2beta1",
"v8.1RC2",
"v8.1.0beta2",
"v8.1.0beta1",
"v8.1.0alpha2",
"v8.1.0alpha1",
"v8.0.0",
"v8.0.0RC2",
"v8.0.0RC1",
"v8.0.0beta2",
"v8.0.0beta1",
"v8.0.0alpha2",
"v8.0.0alpha1",
"v7.0.0beta1",
"v7.0.0alpha2",
"v6.0.0RC2",
"v6.0.0RC1",
"v6.0.0beta5",
"v6.0.0beta4",
"v6.0.0beta3",
"v6.0.0beta2",
"v6.0.0alpha2",
"v5.0.0",
"v5.0.0RC3",
"v5.0.0RC2",
"v5.0.0RC1",
"v5.0.0beta2",
"v5.0.0beta1",
"v5.0.0alpha1",
"v4.5.0",
"v4.5.0RC3",
"v4.5.0RC2",
"v4.5.0RC1",
"v4.5.0beta4",
"v4.5.0beta3",
"v4.0.6",
"v4.0.5",
"v4.0.4",
"v4.0.1",
"v4.0.0",
"v4.0.0RC2",
"v4.0.0RC",
"v4.0.0beta",
"v3.0",
"v1.0.0beta1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8294.json"
}
}
],
"modified": "2026-10-24T10:30:20.145328793Z",
"provider": "osv",
"references": [
"https://nextcloud.com/security/advisory/?id=NC-SA-2021-002",
"https://hackerone.com/reports/1023787"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-8294",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430202,
"published_at": "2021-02-03T17:15:16.293+00:00"
}