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Vulnerability of Cisco Web Security Appliance: Cross Site Scripting

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting of Cisco Web Security Appliance, in order to run JavaScript code in the context of the web site.
Impacted software: AsyncOS, Cisco WSA.
Severity of this computer vulnerability: 2/4.
Creation date: 07/11/2019.
Références of this announce: CERTFR-2019-AVI-548, cisco-sa-20191106-wsa-xss, CSCvp61143, CVE-2019-15969, VIGILANCE-VUL-30808.

Description of the vulnerability 

An attacker can trigger a Cross Site Scripting of Cisco Web Security Appliance, in order to run JavaScript code in the context of the web site.
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This computer vulnerability impacts software or systems such as AsyncOS, Cisco WSA.

Our Vigil@nce team determined that the severity of this weakness bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this weakness.

Solutions for this threat 

Cisco Web Security Appliance: solution CSCvp61143.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvp61143
  https://tools.cisco.com/bugsearch/bug/CSCvp61143
  https://tools.cisco.com/quickview/bug/CSCvp61143
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