Missing Authorization in Nextcloud Server - CVE-2020-8139
Published: March 20, 2020 / Updated: July 17, 2020
Vulnerability identifier: #VU30326
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-8139
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote authenticated user to gain access to sensitive information.
A missing access control check in Nextcloud Server < 18.0.1, < 17.0.4, and < 16.0.9 causes hide-download shares to be downloadable when appending /download to the URL.
Affected software
Nextcloud Server
How to mitigate CVE-2020-8139
Install update from vendor's website.
Nextcloud Server - update to 18.0.1