After guessing a 62^15 complex unique identifier, a malicious logged in user was able to retrieve a list of memberships for a circle they are not a member of.
References
History

Sat, 19 Sep 2026 23:15:00 +0000

Type Values Removed Values Added
Title Logged‑in User Can Enumerate Memberships of Non‑Members via ID Guessing

Sat, 19 Sep 2026 02:15:00 +0000

Type Values Removed Values Added
Title Logged‑in User Can Enumerate Memberships of Non‑Members via ID Guessing

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 18 Sep 2026 11:15:00 +0000

Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud server
Vendors & Products Nextcloud
Nextcloud server

Fri, 18 Sep 2026 01:45:00 +0000

Type Values Removed Values Added
Description After guessing a 62^15 complex unique identifier, a malicious logged in user was able to retrieve a list of memberships for a circle they are not a member of.
Weaknesses CWE-639
References
Metrics cvssV3_0

{'score': 3.1, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published: 2026-09-18T01:26:04.654Z

Updated: 2026-09-18T19:40:16.781Z

Reserved: 2026-07-30T15:00:00.609Z

Link: CVE-2026-68493

cve-icon Vulnrichment

Updated: 2026-09-18T19:40:12.424Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-18T02:17:07.350

Modified: 2026-09-18T20:17:21.037

Link: CVE-2026-68493

cve-icon Redhat

No data.