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CVSS: 9.8EPSS: 0%CPEs: 5EXPL: 0

Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection. Nextcloud server versiones anteriores a 19.0.11, 20.0.10 y 21.0.2, es vulnerable a ataques de fuerza bruta debido a una falta de inclusión de subredes IPv6 en las consideraciones de limitación de velocidad. Esto podría potencialmente resultar en que un atacante omita los controles de limitación de velocidad, como la protección de fuerza bruta de Nextcloud • https://hackerone.com/reports/1154003 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGXGR6HYGQ6MZXISMJEHCOXRGRFRUFMA https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S https://nextcloud.com/security/advisory/?id=NC-SA-2021-009 • CWE-307: Improper Restriction of Excessive Authentication Attempts •

CVSS: 4.3EPSS: 0%CPEs: 3EXPL: 0

Nextcloud Server is a Nextcloud package that handles data storage. In versions of Nextcloud Server prior to 10.0.11, 20.0.10, and 21.0.2, a malicious user may be able to break the user administration page. This would disallow administrators to administrate users on the Nextcloud instance. The vulnerability is fixed in versions 19.0.11, 20.0.10, and 21.0.2. As a workaround, administrators can use the OCC command line tool to administrate the Nextcloud users. • https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fx62-q47f-f665 https://hackerone.com/reports/1147611 https://security.gentoo.org/glsa/202208-17 • CWE-400: Uncontrolled Resource Consumption •

CVSS: 8.6EPSS: 0%CPEs: 3EXPL: 0

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. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2 As a workaround, disable "Add server automatically once a federated share was created successfully" in the Nextcloud settings. • https://github.com/nextcloud/security-advisories/security/advisories/GHSA-j875-vr2q-h6x6 https://hackerone.com/reports/1167853 https://security.gentoo.org/glsa/202208-17 • CWE-284: Improper Access Control •

CVSS: 3.5EPSS: 0%CPEs: 3EXPL: 0

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. • https://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv https://hackerone.com/reports/1167929 https://security.gentoo.org/glsa/202208-17 • CWE-241: Improper Handling of Unexpected Data Type •

CVSS: 9.1EPSS: 0%CPEs: 3EXPL: 0

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to receive write/read privileges on any Federated File Share. Since public links can be added as federated file share, this can also be exploited on any public link. Users can upgrade to patched versions (19.0.11, 20.0.10 or 21.0.2) or, as a workaround, disable federated file sharing. Nextcloud Server es un paquete de Nextcloud que maneja el almacenamiento de datos. • https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jf9h-v24c-22g5 https://hackerone.com/reports/1170024 https://security.gentoo.org/glsa/202208-17 • CWE-639: Authorization Bypass Through User-Controlled Key •