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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.
Vulnerable software: AsyncOS, Cisco WSA.
Severity of this announce: 2/4.
Creation date: 21/01/2021.
Références of this computer vulnerability: CERTFR-2021-AVI-052, cisco-sa-wsa-xss-RuB5WGqL, CSCvu22019, CSCvv27761, CVE-2021-1271, VIGILANCE-VUL-34393.

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 threat impacts software or systems such as AsyncOS, Cisco WSA.

Our Vigil@nce team determined that the severity of this computer threat 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 cybersecurity bulletin.

Solutions for this threat 

Cisco Web Security Appliance: solution CSCvu22019 CSCvv27761.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu22019
  https://tools.cisco.com/bugsearch/bug/CSCvu22019
  https://tools.cisco.com/quickview/bug/CSCvu22019
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv27761
  https://tools.cisco.com/bugsearch/bug/CSCvv27761
  https://tools.cisco.com/quickview/bug/CSCvv27761
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