Server-Side Request Forgery (SSRF) in Nextcloud Server - CVE-2020-8138
Published: March 20, 2020 / Updated: July 17, 2020
Vulnerability identifier: #VU30325
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-2020-8138
CWE-ID: CWE-918
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 check for IPv4 nested inside IPv6 in Nextcloud server < 17.0.1, < 16.0.7, and < 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL.
Affected software
Nextcloud Server
How to mitigate CVE-2020-8138
Install update from vendor's website.
Nextcloud Server - update to 17.0.2