CVE-2023-28835

Name of the Vulnerable Software and Affected Versions Nextcloud Server versions prior to 24.0.10 Nextcloud Server versions prior to 25.0.4

Description The issue is related to the generated fallback password when creating a share in Nextcloud Server, which uses a weak complexity random number generator. This makes the password guessable to an attacker willing to brute force it, especially when the sharer does not change the password. The vulnerability can be exploited by a remote attacker to gain unauthorized access to protected information. It only affects users who do not have a password policy enabled.

Recommendations For Nextcloud Server versions prior to 24.0.10, upgrade to 24.0.10. For Nextcloud Server versions prior to 25.0.4, upgrade to 25.0.4. As a temporary workaround for users unable to upgrade, enable a password policy to mitigate the issue.