Medium
Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames
Type: advisorySources: OSV
Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can rename files in the team folder. This issue has been patched in versions 17.0.15, 18.1.12, 19.1.16, 20.1.11, and 21.0.4.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45264
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 20:27 UTC · Revision 1
Source evidence
Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames
core-osv · Original sourcePublished 1 Jun 2026, 16:36 UTC
Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can rename files in the team folder. This issue has been patched in versions 17.0.15, 18.1.12, 19.1.16, 20.1.11, and 21.0.4.
osv:CVE-2026-45264
Complete source record
{
"id": "2783eaa39bb7c930096f5e2f241b73d8d3b1e40c867f1bc74cdf2a10e6154e2f",
"url": "https://osv.dev/vulnerability/CVE-2026-45264",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames",
"summary": "Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can rename files in the team folder. This issue has been patched in versions 17.0.15, 18.1.12, 19.1.16, 20.1.11, and 21.0.4.",
"evidence": "osv:CVE-2026-45264",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-45264",
"aliases": [
"CVE-2026-45264",
"GHSA-wx2x-822r-rvmf"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nextcloud/groupfolders",
"type": "GIT",
"events": [
{
"introduced": "8f0d9cb8f8438e863af4d2cf58c99d3e1892f6b6"
},
{
"fixed": "596595551aad910c30918ac65fab23b2829576fb"
},
{
"introduced": "9d0b381c73939a2220f252d6e6797a50c53b1268"
},
{
"fixed": "45d3bf6b984cf45a0123bf52629f864f8d713699"
},
{
"introduced": "537df83a0b39e0c3eac8d7ad45a3d53f746d5f33"
},
{
"fixed": "3bdfd9bcb4bbba4cf41d8b3feeecc02fcc039c9d"
},
{
"introduced": "0f3241e1dd817aee8c740046d0abce29e2a81b25"
},
{
"fixed": "247081196b0f76768b8827983eafeb80748f65e1"
},
{
"introduced": "b17eb1ef1c4646a3f986aabc3a257d578f1aae55"
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{
"fixed": "e2ab43a7630cbfcfbd0a4f9ffe3e9af9a2727dae"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "17.0.0"
},
{
"fixed": "17.0.15"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "18.0.0"
},
{
"fixed": "18.1.12"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "19.0.0"
},
{
"fixed": "19.1.16"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
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},
{
"fixed": "20.1.11"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "21.0.0"
},
{
"fixed": "21.0.4"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
}
],
"versions": [
"v17.0.14",
"v21.0.3",
"v20.1.10",
"v18.1.11",
"v21.0.2",
"v20.1.9",
"v21.0.1",
"v20.1.8",
"v21.0.0",
"v20.1.7",
"v18.1.10",
"v18.1.9",
"v20.1.5",
"v20.1.4",
"v18.1.8",
"v20.1.3",
"v20.1.2",
"v17.0.13",
"v20.1.1",
"v18.1.7",
"v20.1.0",
"v18.1.6",
"v20.0.1",
"v17.0.12",
"v18.1.5",
"v20.0.0",
"v17.0.11",
"v18.1.4",
"v18.1.3",
"v18.1.1",
"v18.1.2",
"v18.0.6",
"v18.1.0",
"v17.0.10",
"v18.0.10",
"v17.0.1",
"v17.0.9",
"v18.0.9",
"v18.0.8",
"v17.0.8",
"v17.0.7",
"v18.0.7",
"v17.0.6",
"v18.0.5",
"v18.0.4",
"v17.0.5",
"v18.0.3",
"v17.0.4",
"v18.0.2",
"v18.0.1",
"v17.0.3",
"v17.0.2",
"v18.0.0",
"v17.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45264.json"
}
}
],
"modified": "2026-10-28T02:30:51.534318453Z",
"provider": "osv",
"references": [
"https://hackerone.com/reports/3540673",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45264.json",
"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wx2x-822r-rvmf",
"https://nvd.nist.gov/vuln/detail/CVE-2026-45264",
"https://github.com/nextcloud/groupfolders/pull/4361"
],
"provider_metadata": {
"cwe_ids": [
"CWE-284"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45264.json"
}
},
"related_cves": [
{
"value": "CVE-2026-45264",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 520308,
"published_at": "2026-06-01T16:36:57.13+00:00"
}