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Improper validation of permissions (NC-SA-2018-010)

25th October 2018

Risk level: Low

CVSS v3 Base Score: 6.4 (AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N)

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

HackerOne report: 388515


Improper revalidation of permissions lead to not accepting access restrictions by acess tokens.

Affected Software

  • Nextcloud Server < 14.0.0 (CVE-2018-16466)
  • Nextcloud Server < 13.0.6 (CVE-2018-16466)
  • Nextcloud Server < 12.0.11 (CVE-2018-16466)

Action Taken

The error has been fixed.


It is recommended that all instances are upgraded to Nextcloud 14.0.0, Nextcloud 13.0.6 or Nextcloud 12.0.11.


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

  • Mohd Haji - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

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