Users can delete external storage mount points
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 19.0.0 and prior to versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a malicious user could delete any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. As a workaround, disable app files_external. This also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2023-39962
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 22:14 UTC · Revision 1
Source evidence
Users can delete external storage mount points
core-osv · Original sourcePublished 10 Aug 2023, 17:23 UTC
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 19.0.0 and prior to versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a malicious user could delete any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. As a workaround, disable app files_external. This also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.
osv:CVE-2023-39962
Complete source record
{
"id": "42fbebea23ead844e18e87a5bf97afd3954e9bb53a6ed822125dd61bfda23848",
"url": "https://osv.dev/vulnerability/CVE-2023-39962",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Users can delete external storage mount points",
"summary": "Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 19.0.0 and prior to versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a malicious user could delete any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. As a workaround, disable app files_external. This also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.",
"evidence": "osv:CVE-2023-39962",
"products": [],
"severity": "high",
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"aliases": [
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"GHSA-xwxx-2752-w3xm"
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"type": "CVSS_V3",
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"affected": [
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"type": "GIT",
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"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*",
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],
"versions": [
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"v25.0.9rc2",
"v26.0.4rc2",
"v26.0.4rc1",
"v25.0.9rc1",
"v25.0.8",
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"v25.0.8rc1",
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"v25.0.7rc1",
"v26.0.2rc1",
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"v25.0.2rc1",
"v25.0.1",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-39962.json"
}
}
],
"modified": "2026-10-28T02:30:39.940218885Z",
"provider": "osv",
"references": [
"https://hackerone.com/reports/2047168",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39962.json",
"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xwxx-2752-w3xm",
"https://nvd.nist.gov/vuln/detail/CVE-2023-39962",
"https://github.com/nextcloud/server/pull/39323"
],
"provider_metadata": {
"cwe_ids": [
"CWE-284"
],
"cna_assigner": "GitHub_M",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "19.0.0"
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{
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{
"introduced": "20.0.0"
},
{
"fixed": "20.0.14.15"
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{
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{
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{
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{
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{
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{
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{
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{
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],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39962.json"
}
},
"related_cves": [
{
"value": "CVE-2023-39962",
"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 507511,
"published_at": "2023-08-10T17:23:50.261+00:00"
}