CVE-2023-39962 Information

Description

Nextcloud Server provides data storage for Nextcloud an open source cloud platform. Starting in version 19.0.0 and prior to versions 19.0.13.10 20.0.14.15 21.0.9.13 22.2.10.14 23.0.12.8 24.0.12.5 25.0.9 26.0.4 and 27.0.1 a malicious user could delete any personal or global external storage making them inaccessible for everyone else as well. Nextcloud server versions 25.0.9 26.0.4 and 27.0.1 and Nextcloud Enterprise Server versions 19.0.13.10 20.0.14.15 21.0.9.13 22.2.10.14 23.0.12.9 24.0.12.5 25.0.9 26.0.4 and 27.0.1 contain a patch for this issue. As a workaround disable app files_external. This also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.

Reference

https://github.com/nextcloud/server/pull/39323 https://hackerone.com/reports/2047168 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xwxx-2752-w3xm