Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 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, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2. Three workarounds are available. Disable app files_external. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages`. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages` with the types FTP, Nextcloud, SFTP, and/or WebDAV.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:HNextcloud Server
APPNextcloud19.0.0 – 19.0.13.9 (bez)20.0.0 – 20.0.14.14 (bez)21.0.0 – 21.0.9.12 (bez)22.0.0 – 22.2.10.12 (bez)23.0.0 – 23.0.12.7 (bez)24.0.0 – 24.0.12.2 (bez)25.0.0 – 25.0.7 (bez)26.0.0 – 26.0.2 (bez)
Related vulnerabilities
Nextcloud server is an open source home cloud implementation. In affected versions a missing scope validation ...
Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews fo...
Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion...
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before...
Nextcloud server is a self hosted personal cloud system. Under some circumstance it was possible to bypass the...