{"containers": {"cna": {"affected": [{"product": "security-advisories", "vendor": "nextcloud", "versions": [{"status": "affected", "version": "< 19.0.11"}, {"status": "affected", "version": ">= 20.0.0, < 20.0.10"}, {"status": "affected", "version": ">= 21.0.0, < 21.0.2"}]}], "descriptions": [{"lang": "en", "value": "Nextcloud Server is a Nextcloud package that handles data storage. A vulnerability in federated share exists in versions prior to 19.0.11, 20.0.10, and 21.0.2. An attacker can gain access to basic information about users of a server by accessing a public link that a legitimate server user added as a federated share. This happens because Nextcloud supports sharing registered users with other Nextcloud servers, which can be done automatically when selecting the \"Add server automatically once a federated share was created successfully\" setting. 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Un atacante puede obtener acceso a informaci\u00f3n b\u00e1sica sobre los usuarios de un servidor al acceder a un enlace p\u00fablico que un usuario leg\u00edtimo del servidor haya a\u00f1adido como recurso compartido federado. Esto ocurre porque Nextcloud admite compartir usuarios registrados con otros servidores Nextcloud, lo que puede hacerse autom\u00e1ticamente al seleccionar el ajuste \"Add server automatically once a federated share was created successfully\". 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