Improper access control in Nextcloud Enterprise Server and Nextcloud Server - CVE-2023-35927
Published: June 23, 2023
Vulnerability identifier: #VU77663
CSH Severity: Medium
CVSS v4: 5.2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-35927
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 improper access restrictions when two servers are registered as trusted servers for each other and successfully exchanged the share secrets. A remote user can modify or delete VCards in the system addressbook on the origin server.
Affected software
Nextcloud Enterprise Server
Nextcloud Server
Nextcloud Server
How to mitigate CVE-2023-35927
Install updates from vendor's website.
Nextcloud Enterprise Server - addressed in versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, 26.0.2
Nextcloud Server - addressed in versions 25.0.7, 26.0.2
Nextcloud Server - addressed in versions 25.0.7, 26.0.2