Nextcloud Server is prone to a content-spoofing vulnerability.
Attackers can exploit this issue to manipulate and spoof content, which may aid in further attacks.
Versions prior to Nextcloud Server 9.0.55 and 10.0.2 are vulnerable.
Information
Nextcloud Nextcloud Server 10.0
Nextcloud Nextcloud Server 9.0.54
Nextcloud Nextcloud Server 9.0.50
Nextcloud Nextcloud Server 9.0
Nextcloud Nextcloud Server 9.0.55
Exploit
An attacker can exploit this issue using a browser.
References:
- Content Spoofing in "files" app (hackerone.com)
- Nextcloud Homepage (Nextcloud)
- Content-Spoofing in "files" app (NC-SA-2017-006) (Nextcloud)