CVE-2023-25579: Nextcloud Server

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Nextcloud server is a self hosted home cloud product. In affected versions the `OC\Files\Node\Folder::getFullPath()` function was validating and normalizing the string in the wrong order. The function is used in the `newFile()` and `newFolder()` items, which may allow to creation of paths outside of ones own space and overwriting data from other users with crafted paths. This issue has been addressed in versions 25.0.2, 24.0.8, and 23.0.12. Users are advised to upgrade. There are no known workarounds for this issue.

Affected products

• Nextcloud Nextcloud Server: before 23.0.12 (fixed in 23.0.12); from 20.0.0, before 20.0.14 (fixed in 20.0.14); from 21.0.0, before 21.0.9 (fixed in 21.0.9); from 22.2.0, before 22.2.10 (fixed in 22.2.10); from 23.0.0, before 23.0.12 (fixed in 23.0.12); from 24.0.0, before 24.0.8 (fixed in 24.0.8); …

Published 2023-02-22. Last modified 2026-06-17.