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.
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: