CVE-2018-3762 (https://nvd.nist.gov/vuln/detail/CVE-2018-3762): Nextcloud Server before 12.0.8 and 13.0.3 suffers from improper checks of dropped permissions for incoming shares allowing a user to still request previews for files it should not have access to. CVE-2018-3761 (https://nvd.nist.gov/vuln/detail/CVE-2018-3761): Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.
13.0.4 was already in tree, I just added 12.0.9 and removed affected versions