What’s Vulnerable › Vulnerabilities

CVE-2018-12246

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-10-22 · updated 2026-06-17
• Weakness: CWE-79

Description

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 Corporation Symantec Web Isolation: from 1.11 before 1.11.21 — fixed in 1.11.21

How to fix

Upgrade to a fixed version: Symantec Corporation Symantec Web Isolation 1.11.21. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/105581
• https://support.symantec.com/content/unifiedweb/en_US/article.SYMSA1464.html
• http://www.securityfocus.com/bid/105581
• https://support.symantec.com/content/unifiedweb/en_US/article.SYMSA1464.html

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