29th July 2019
Risk level: Low
CVSS v3 Base Score: 2 (AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N)
CWE: Improper Neutralization of Input During Web Page Generation (CWE-79)
HackerOne report: 662204
Improper neutralization of file names, conversation names and board names in Nextcloud Server 16.0.3, Nextcloud Talk 6.0.3 and Nextcloud Deck 0.6.5 causes an XSS when linking them with each others in a project.
The error has been fixed.
It is recommended that the Nextcloud Deck is upgraded to 0.6.6.
The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory: