Security Advisory – CVE-2019-5450

Product: Nextcloud App on Android
Vendor : Nextcloud GmbH.
Vulnerable Version: Nextcloud Android < 3.7.0
Category: Improper Neutralization of Script-Related HTML Tags in a Web Page (CWE-80)
Vendor Notified: 2019-06-28
Patched: July 9 2019
Researcher(s) : Christian Angel
CVE: 2019-5450

Nextcloud is a suite of client-server software for creating and using file hosting services. Nextcloud application functionally is similar to Dropbox. Unlike Dropbox, Nextcloud does not offer off-premises file storage hosting.


HTML Tags such as <h1> , <small> , <href> and <img> are Getting Executed in Next Cloud Client Mobile Application for Android which can then Result to Code Injection.

Proof of Concept


Update the application to the latest version