Reported by 3 outlets

Microsoft tackles active Outlook zero-day vulnerability in massive monthly security release

ZDNET

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AI summary of the reporting below · Updated · How we work

Microsoft rolled out its November 2026 Patch Tuesday updates to address over a thousand security vulnerabilities across its product ecosystem, headlined by a fix for an actively exploited zero-day flaw in Microsoft Outlook. Outlets reported varying counts for the total scope of the patch bundle, with SecurityWeek tallying 1,094 resolved flaws while BleepingComputer placed the figure at 1,235. [2][3]

The confirmed zero-day bug, tracked as CVE-2026-124194, is classified as a Microsoft Outlook spoofing vulnerability that Microsoft acknowledges has seen active exploitation. When connecting, Windows can automatically try to authenticate with a remote server, which exposes the targeted user's NTLMv2 authentication hash and allows an attacker to capture and potentially crack it offline. [2][3]

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3 outlets

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