Internet Explorer 5.1 for Macintosh allows remote attackers to bypass security checks and invoke local AppleScripts within a specific HTML element, aka the "Local Applescript Invocation" vulnerability.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7969
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-019
http://www.securityfocus.com/bid/3935