Cisco Web Security Appliance XSS (cisco-sa-wsa-xss-mVjOWchB)

medium Nessus Plugin ID 149450


The remote device is missing a vendor-supplied security patch.


According to its self-reported version, Cisco Web Security Appliance is affected by a cross-site scripting (XSS) vulnerability due to improper validation of user-supplied input before returning it to users. An unauthenticated, remote attacker can exploit, by convincing a user to click a specially crafted URL, to execute arbitrary script code in a user's browser session. Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvv18456, CSCvv26363, CSCvx74586

See Also

Plugin Details

Severity: Medium

ID: 149450

File Name: cisco-sa-wsa-xss-mVjOWchB.nasl

Version: 1.11

Type: combined

Family: CISCO

Published: 5/13/2021

Updated: 6/3/2021

Risk Information


Risk Factor: Low

Score: 3.0


Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2021-1490


Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/h:cisco:web_security_appliance, cpe:/a:cisco:web_security_appliance, cpe:/o:cisco:web_security_appliance, cpe:/o:cisco:asyncos

Required KB Items: Host/AsyncOS/Cisco Web Security Appliance/DisplayVersion, Host/AsyncOS/Cisco Web Security Appliance/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 5/5/2021

Vulnerability Publication Date: 5/5/2021

Reference Information

CVE: CVE-2021-1490

CWE: 79

CISCO-SA: cisco-sa-wsa-xss-mVjOWchB

IAVA: 2021-A-0238-S

CISCO-BUG-ID: CSCvv18456, CSCvv26363, CSCvx74586