CVE-2012-1878: Microsoft Internet Explorer

High severity, CVSS 9.3. EPSS: 22.3% chance of exploitation in the next 30 days.

Microsoft Internet Explorer 6 through 9 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing a deleted object, aka "OnBeforeDeactivate Event Remote Code Execution Vulnerability."

Affected products

• Microsoft Internet Explorer: version 6 only; version 7 only; version 8 only; version 9 only

Published 2012-06-12. Last modified 2026-06-16.