Reflected XSS in error pages (NC-SA-2017-008)
8th May 2017
Risk level: Low
CVSS v3 Base Score: 3.5 (AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N)
HackerOne report: 216812
Inadequate escaping of error messages leads to XSS vulnerabilities in multiple components.Note that Nextcloud employs a strict Content-Security-Policy preventing exploitation of this XSS issue on modern web browsers.
- Nextcloud Server < 11.0.3 (CVE-2017-0891)
- Nextcloud Server < 10.0.5 (CVE-2017-0891)
- Nextcloud Server < 9.0.58 (CVE-2017-0891)
Error messages are now properly escaped.
It is recommended that all instances are upgraded to Nextcloud 9.0.58, 10.0.5 or 11.0.3.
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.