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Nextcloud: Critical broken access control: API-only delegated admin can enumerate all Team Folders and grant access to arbitrary groups

🗓️ 15 Apr 2026 10:09:16Reported by qlooType 
hackerone
 hackerone
🔗 hackerone.com👁 20 Views

Broken access control in Nextcloud Group Folders lets delegated admin access arbitrary Team Folders.

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17 Sep 2026 10:41Current
6.8Medium risk
Vulners AI Score6.8
CVSS 36.5
EPSS0.00469
SSVC
20