Security Advisory

Back to advisories

Renaming an item to a protected hidden folder deletes the target (NC-SA-2020-017)

15th July 2019

Risk level: Low

CVSS v3 Base Score: 6.8 (AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H)

CWE: Improper Access Control - Generic (CWE-284)

HackerOne report: 642515


Improper access control in Groupfolders app 4.0.3 allowed to delete hidden directories when when renaming an accessible item to the same name.

Affected Software

  • Nextcloud Groupfolders < 4.0.4 (CVE-2020-8153)

Action Taken

The error has been fixed.


It is recommended that the Groupfolders app is upgraded to 4.0.4.


The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:

  • Francesco MORO(sinotto) - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

You have javascript disabled. We tried to make sure the basics of our website work but some functionality will be missing.

This website is using cookies. By visiting you agree with our privacy policy. That's Fine