Microsoft Edge and Internet Explorer Type Confusion Vulnerability
What it is
Microsoft Edge and Internet Explorer have a type confusion vulnerability in mshtml.dll, which allows remote code execution.
Who's affected
Affects anyone using Microsoft Edge as their browser. The browser is the entry point for cloud apps (accounting SaaS, client portals, banking) — exploitation can lead to session theft or stored-credential exposure for everything you log into through it.
What to do
Apply updates per vendor instructions.
CISA action deadline: April 18, 2022. Federal agencies must complete the required action by this date. For private SMBs the deadline is advisory — but treat it as a strong recommendation, especially if you handle regulated data (HIPAA, GLBA, ABA model rules).
If you don't have someone in-house to verify the patch deployed across every endpoint — or you're not sure whether you're affected — that's exactly the kind of triage we do. Book a free 20-minute triage call.
Severity
CVSS base score: 8.1 — HIGH
Weakness classification: CWE-843
Source
Pulled daily from the public cisagov/kev-data mirror (CC0). View the original entry on cisa.gov. CISA KEV is US-Government public-domain data; we add the SMB-vertical framing and the coping action above.