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Social App does not validate server certificates for outgoing connections (NC-SA-2020-043)

15th October 2020

Risk level: Low

CVSS v3 Base Score: 5.4 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)

CWE: Improper Certificate Validation (CWE-295)

HackerOne report: 915585


Missing validation of server certificates for out-going connections allowed a man-in-the-middle attack.

Affected Software

  • Nextcloud Social < 0.4.0 (CVE-2020-8279)

Action Taken

The error has been fixed.


It is recommended that the Social app is upgraded to 0.4.0.


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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