CVE-2021-32726 Information

Description

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13 20.011 and 21.0.3 webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username the previous user could gain access to their account. The issue was fixed in versions 19.0.13 20.0.11 and 21.0.3. There are no known workarounds.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://hackerone.com/reports/1202590 https://github.com/nextcloud/server/pull/27532 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8