Critical
Security advisory
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-32726
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:46 UTC · Revision 1
Source evidence
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.
osv:CVE-2021-32726
Complete source record
{
"id": "2ab7c1df9b835a68aac3dd40f17a085ddb625b6ada194232fbf7941746132602",
"url": "https://osv.dev/vulnerability/CVE-2021-32726",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-32726",
"summary": "Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.",
"evidence": "osv:CVE-2021-32726",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2021-32726",
"aliases": [
"CVE-2021-32726",
"GHSA-6qr9-c846-j8mg"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nextcloud/server",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "3845aa47869e6787bf9b25cae59f9b999c6f7807"
},
{
"introduced": "615b994816710a595243d704c9be445f736b4b41"
},
{
"fixed": "3eb0ce9892933c36672e8ba35e771e48a5309321"
},
{
"introduced": "8985b7930653139859002eb3eca2852999ed8f0d"
},
{
"fixed": "5d04a3fed226c370feca686032f47d5422b02bb2"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "19.0.13"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "20.0.0"
},
{
"fixed": "20.0.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "21.0.0"
},
{
"fixed": "21.0.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v19.0.13rc1",
"v21.0.3rc1",
"v20.0.11rc1",
"v19.0.11",
"v20.0.10",
"v21.0.2",
"v19.0.11RC1",
"v20.0.10RC1",
"v21.0.2RC1",
"v19.0.10",
"v20.0.9",
"v21.0.1",
"v19.0.10RC1",
"v21.0.1RC1",
"v20.0.9RC1",
"v19.0.9",
"v20.0.8",
"v21.0.0",
"v19.0.9RC1",
"v20.0.8RC1",
"v20.0.7RC1",
"v20.0.7",
"v19.0.8",
"v20.0.6",
"v19.0.8RC1",
"v20.0.6RC1",
"v19.0.7",
"v20.0.5",
"v20.0.5RC2",
"v19.0.7RC1",
"v20.0.5RC1",
"v20.0.4",
"v19.0.6",
"v20.0.3",
"v19.0.6RC2",
"v20.0.3RC2",
"v19.0.5",
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"v19.0.5RC2",
"v20.0.2RC2",
"v19.0.5RC1",
"v20.0.2RC1",
"v20.0.1",
"v20.0.1RC1",
"v19.0.4",
"v19.0.4RC2",
"v20.0.0",
"v19.0.40RC1",
"v19.0.3",
"v19.0.3RC1",
"v19.0.2",
"v19.0.2RC2",
"v19.0.2RC1",
"v19.0.1",
"v19.0.1RC1",
"v19.0.0",
"v19.0.0RC3",
"v19.0.0RC1",
"v19.0.0beta7",
"v19.0.0beta6",
"v19.0.0beta5",
"v19.0.0beta4",
"v19.0.0beta3",
"v19.0.0beta2",
"v19.0.0beta1",
"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-2021-32726.json"
}
}
],
"modified": "2026-10-20T10:54:42.514980707Z",
"provider": "osv",
"references": [
"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg",
"https://github.com/nextcloud/server/pull/27532",
"https://security.gentoo.org/glsa/202208-17",
"https://hackerone.com/reports/1202590"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-32726",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 385948,
"published_at": "2021-07-12T20:15:10.037+00:00"
}