Reflected XSS in Gallery application (NC-SA-2016-009)
10th October 2016
Risk level: Medium
CVSS v3 Base Score: 6.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
HackerOne report: 165686
The gallery app was not properly sanitizing exception messages from the Nextcloud server. Due to an endpoint where an attacker could influence the error message this lead to a reflected Cross-Site-Scripting vulnerability.
- Nextcloud Server < 10.0.1 (CVE-2016-9466)
Error messages are now properly sanitized.
It is recommended that all instances are upgraded to Nextcloud 10.0.1.
The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:
- Aliaksei Panamarenka - Vulnerability discovery and disclosure.
This advisory is licensed CC BY-SA 4.0.