Information disclosure in Nextcloud Server - CVE-2021-32653
Published: June 7, 2021
Vulnerability identifier: #VU53827
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32653
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the Nextcloud Server sends user IDs to the lookup server even if the user has no fields set to published. A remote attacker can gain unauthorized access to sensitive information on the system.
Affected software
Nextcloud Server
How to mitigate CVE-2021-32653
Install updates from vendor's website.
Nextcloud Server - addressed in versions 19.0.11, 20.0.10, 21.0.2