Nextcloud CVE-2017-0891 Multiple Cross Site Scripting Vulnerabilities

Bugtraq ID:	98411
Class:	Design Error
CVE:	CVE-2017-0891
Remote:	Yes
Local:	No
Published:	May 08 2017 12:00AM
Updated:	May 08 2017 12:00AM
Credit:	Manuel Mancera
Vulnerable:	Nextcloud Nextcloud 10.0.1 Nextcloud Nextcloud 9.0.52 Nextcloud Nextcloud 9.0.51 Nextcloud Nextcloud 9.0.54 Nextcloud Nextcloud 11.0 Nextcloud Nextcloud 10.0.0
Not Vulnerable:	Nextcloud Nextcloud 11.0.3 Nextcloud Nextcloud 10.0.5 Nextcloud Nextcloud 9.0.58

Nextcloud CVE-2017-0891 Multiple Cross Site Scripting Vulnerabilities

Nextcloud is prone to multiple cross-site scripting vulnerabilities because it fails to sanitize user-supplied input.

An attacker may leverage these issues to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may let the attacker steal cookie-based authentication credentials and launch other attacks.

Versions prior to Nextcloud 11.0.3, 10.0.5 and 9.0.58 are vulnerable.

Nextcloud CVE-2017-0891 Multiple Cross Site Scripting Vulnerabilities

An attacker can exploit these issues by enticing an unsuspecting user to visit a specially crafted URL.

Nextcloud CVE-2017-0891 Multiple Cross Site Scripting Vulnerabilities

Solution:
Updates are available. Please see the references or vendor advisory for more information.

Nextcloud CVE-2017-0891 Multiple Cross Site Scripting Vulnerabilities

References:

• Nextcloud Homepage (Nextcloud)
  
• Reflected XSS in error pages (NC-SA-2017-008) (Nextcloud)