Microsoft Confirms Active Exploitation Of New Outlook Zero-Day | November Patch Tuesday boasts ov…

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November Patch Tuesday boasts over 1,000 bugs, one already under attack

It’s another doozy of a Patch Tuesday, with Microsoft fixing 1,094 bugs in its products, including one that attackers exploited before Redmond released a patch. Jake Knott, head of threat intelligence at exposure management firm watchTowr, succinctly said in an email to The Register: “Maybe we should just go home.”

“Most security teams haven’t quite recovered from the last month of bumper-to-bumper critical vulnerabilities, emergency patches, and ‘2shell’-branded everything, and we’re yet again at another Patch Tuesday,” Knott told us.

Starting with the zero-day: It’s an Outlook spoofing vulnerability, tracked as CVE-2026-124194, and it only garnered a 6.5 out of 10 CVSS rating. But as Dustin Childs, head of threat awareness at TrendAI’s Zero Day Initiative, warns, don’t let the score or the name lull you into thinking it’s OK to put off patching this one.

CVE-2026-124194: Outlook Zero-Day Exposes NTLM Hashes

Microsoft has patched CVE-2026-124194, an actively exploited zero-day vulnerability in Microsoft Outlook that can expose a user’s NTLMv2 authentication information when a specially crafted message file is opened. Microsoft classifies the issue as a spoofing vulnerability and rates it Moderate with a CVSS 3.1 score of 6.5.

The vulnerability allows an unauthenticated remote attacker to send a malicious message file and convince a victim to open it in an affected Outlook version. Outlook can then connect to an attacker-controlled network location without displaying the external-content warning users would normally expect. During that connection, Windows may expose NTLMv2 authentication information that can potentially be abused to impersonate the victim.

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