CVE-2018-12246: Symantec Web Isolation

Medium severity, CVSS 6.1. EPSS: 1% chance of exploitation in the next 30 days.

Symantec Web Isolation (WI) 1.11 prior to 1.11.21 is susceptible to a reflected cross-site scripting (XSS) vulnerability. A remote attacker can target end users protected by WI with social engineering attacks using crafted URLs for legitimate web sites. A successful attack allows injecting malicious JavaScript code into the website's rendered copy running inside the end user's web browser. It does not allow injecting code into the real (isolated) copy of the website running on the WI Threat Isolation Engine.

Affected products

• Symantec Web Isolation: from 1.11, before 1.11.21 (fixed in 1.11.21)

Published 2018-10-22. Last modified 2026-06-17.