CVE-2026-68493

Published Sep 18, 2026 CVSS 3.0 · 3.1 Low EPSS < 1% KEV · Not listed
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.

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

{'options': {'Automatable': 'no', 'Exploitation': 'none', '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
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
hackerone
Published
Updated
Sep 18, 2026, 7:40 PM
Reserved
Jul 30, 2026, 3:00 PM
Status
Awaiting Analysis
Published
Sep 18, 2026, 2:17 AM
Modified
Sep 18, 2026, 8:17 PM