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CVSS: 8.1EPSS: 0%CPEs: 10EXPL: 0

NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, when two server are registered as trusted servers for each other and successfully exchanged the share secrets, the malicious server could modify or delete VCards in the system addressbook on the origin server. This would impact the available and shown information in certain places, such as the user search and avatar menu. If a manipulated user modifies their own data in the personal settings the entry is fixed again. Nextcloud Server n 25.0.7 and 26.0.2 and Nextcloud Enterprise Server 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2 contain a patch for this issue. A workaround is available. • https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h7f7-535f-7q87 https://github.com/nextcloud/server/pull/38247 https://hackerone.com/reports/1976754 • CWE-284: Improper Access Control •

CVSS: 9.1EPSS: 0%CPEs: 8EXPL: 0

NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, an attacker can bruteforce the password reset links. Nextcloud Server n 25.0.7 and 26.0.2 and Nextcloud Enterprise Server 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2 contain a patch for this issue. No known workarounds are available. • https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mjf5-p765-qmr6 https://github.com/nextcloud/server/pull/38267 https://hackerone.com/reports/1987062 • CWE-307: Improper Restriction of Excessive Authentication Attempts •

CVSS: 8.7EPSS: 0%CPEs: 8EXPL: 0

Nextcloud Server is a data storage system for Nextcloud, a self-hosted productivity platform. When multiple requests are sent in parallel, all of them were executed even if the amount of faulty requests succeeded the limit by the time the response was sent to the client. This allowed someone to send as many requests the server could handle in parallel to bruteforce protected details instead of the configured limit, default 8. Nextcloud Server versions 25.0.7 and 26.0.2 and Nextcloud Enterprise Server versions 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7 and 26.0.2 contain patches for this issue. • https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qphh-6xh7-vffg https://github.com/nextcloud/server/pull/38274 https://hackerone.com/reports/1918525 • CWE-307: Improper Restriction of Excessive Authentication Attempts •

CVSS: 8.8EPSS: 0%CPEs: 13EXPL: 0

Nextcloud is a personal home server system. Depending on the set up tags and other workflows this issue can be used to limit access of others or being able to grant them access when there are system tag based files access control or files retention rules. It is recommended that the Nextcloud Server is upgraded to 24.0.11 or 25.0.5, the Nextcloud Enterprise Server to 21.0.9.11, 22.2.10.11, 23.0.12.6, 24.0.11 or 25.0.5, and the Nextcloud Files automated tagging app to 1.11.1, 1.12.1, 1.13.1, 1.14.2, 1.15.3 or 1.16.1. Users unable to upgrade should disable all workflow related apps. Users are advised to upgrade. • https://github.com/nextcloud/files_automatedtagging/pull/705 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m2f-v8x7-9w99 https://github.com/nextcloud/server/pull/37252 https://hackerone.com/reports/1895976 • CWE-284: Improper Access Control •

CVSS: 9.0EPSS: 0%CPEs: 8EXPL: 0

Nextcloud server is an open source home cloud implementation. In affected versions a missing scope validation allowed users to create workflows which are designed to be only available for administrators. Some workflows are designed to be RCE by invoking defined scripts, in order to generate PDFs, invoking webhooks or running scripts on the server. Due to this combination depending on the available apps the issue can result in a RCE at the end. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. • https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60 • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') •