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Improper integrity protection of server-side encryption keys (NC-SA-2020-041)

3rd October 2020

Risk level: Low

CVSS v3 Base Score: 7.4 (AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N)

CWE: Insufficiently Protected Credentials (CWE-522)

HackerOne report: 732431


Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the encryption keys.

Affected Software

  • Nextcloud Server < 20.0.0 (CVE-2020-8259)

Action Taken

The error has been fixed.


It is recommended that the Nextcloud Server is upgraded to 20.0.0.


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

This advisory is licensed CC BY-SA 4.0.

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