Nextcloud system addressbooks can be modified by malicious trusted server

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. Remove all trusted servers in the "Administration" > "Sharing" settings `…/index.php/settings/admin/sharing`. Afterwards, trigger a recreation of the local system addressbook with the following `occ dav:sync-system-addressbook`.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L

访问控制不恰当

Nextcloud 访问控制错误漏洞

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 NextCloud Server存在访问控制错误漏洞，该漏洞源于允许恶意服务器修改或删除源站系统通讯录中的VCard。受影响的产品和版本：NextCloud Server 25.0.0至25.0.7版本，26.0.0至26.0.2版本；Nextcloud Enterprise Server 21.0.0至21.0.9.12版本，22.0.0至22.2.10.12版本，23.0.0至23.0.12.7版本，24.

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