A security issue has been reported in Microsoft Windows, which can be exploited by malicious, local users to gain escalated privileges.
The security issue is caused due to an insufficient integrity check of the Task Scheduler jobs (%SystemRoot%\system32\Tasks\) and can be exploited to modify the XML job file to e.g. execute a task with higher privileges.
NOTE: The security issue is currently being actively exploited.
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Subject: Microsoft Windows Task Scheduler Privilege Escalation Security Issue