CVE-2026-77165

Permanent File Locks due to Improper Access Control in Nextcloud Server

Published Sep 21, 2026 CVSS 3.0 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
File owners were unable to unlock TYPE_TOKEN locks placed by other users, leaving files permanently locked with no recovery path outside of the database.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud server
Vendors & Products Nextcloud
Nextcloud server
Type Values Removed Values Added
Title Permanent File Locks due to Improper Access Control in Nextcloud Server
Type Values Removed Values Added
Description File owners were unable to unlock TYPE_TOKEN locks placed by other users, leaving files permanently locked with no recovery path outside of the database.
Weaknesses CWE-284
References
Metrics cvssV3_0

{'score': 6.5, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
hackerone
Published
Updated
Sep 21, 2026, 6:44 PM
Reserved
Aug 20, 2026, 3:00 PM
Status
Deferred
Published
Sep 21, 2026, 4:17 PM
Modified
Sep 22, 2026, 8:00 PM