Improper access control in Nextcloud Server - CVE-2021-32656
Published: June 7, 2021
Vulnerability identifier: #VU53830
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-2021-32656
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to the trusted servers exchange can be triggered by attacker. A remote attacker can trigger this exchange if they have access to a public link and gain access to basic user information.
Affected software
Nextcloud Server
How to mitigate CVE-2021-32656
Install updates from vendor's website.
Nextcloud Server - addressed in versions 19.0.11, 20.0.10, 21.0.2