Low
Security advisory
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-32655
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:12 UTC · Revision 1
Source evidence
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.
osv:CVE-2021-32655
Complete source record
{
"id": "b22cb6ad2f27b24625df776c804ecf05d95f754f8628245a9300f63b38ecca81",
"url": "https://osv.dev/vulnerability/CVE-2021-32655",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-32655",
"summary": "Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the \"Create\" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.",
"evidence": "osv:CVE-2021-32655",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2021-32655",
"aliases": [
"CVE-2021-32655",
"GHSA-grph-cm44-p3jv"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nextcloud/server",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "ea6649a511ec5963b984342a50103c3637d621a3"
},
{
"introduced": "615b994816710a595243d704c9be445f736b4b41"
},
{
"fixed": "6e537422555592ba6542780533963a67fff68cf1"
},
{
"introduced": "8985b7930653139859002eb3eca2852999ed8f0d"
},
{
"fixed": "59752ce269dfb122ef9e3ae56c33464551aa74e1"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "19.0.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "20.0.0"
},
{
"fixed": "20.0.10"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "21.0.0"
},
{
"fixed": "21.0.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"v20.0.10RC1",
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"v20.0.9",
"v21.0.1",
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"v19.0.2",
"v19.0.2RC2",
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"v19.0.1",
"v19.0.1RC1",
"v19.0.0",
"v19.0.0RC3",
"v19.0.0RC1",
"v19.0.0beta7",
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"v16.0.0alpha1",
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"v15.0.0beta2",
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"v13.0.0RC1",
"v13.0.0beta4",
"v13.0.0beta3",
"v13.0.0beta2",
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"v8.1.0alpha2",
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"v8.0.0beta2",
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"v8.0.0alpha2",
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"v4.0.0beta",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32655.json"
}
}
],
"modified": "2026-10-24T10:30:36.666513997Z",
"provider": "osv",
"references": [
"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv",
"https://security.gentoo.org/glsa/202208-17",
"https://hackerone.com/reports/1167929"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-32655",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 434033,
"published_at": "2021-06-01T21:15:07.727+00:00"
}