A vulnerability in the HTTP web-based management interface of the Cisco Jabber Guest application could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web interface.

The vulnerability is due to insufficient input validation of the HTTP host tag parameter. An attacker could exploit this vulnerability by convincing a user to click a specific link.

Additional information about XSS attacks and potential mitigations is at the following links:

Understanding Cross-Site Scripting Threat Vectors
Cross-Site Scripting

Cisco has not released software updates that address this vulnerability. Workarounds that address this vulnerability are not available.

This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160203-jgs