CISA Orders Federal Agencies to Patch Actively Exploited Outlook Spoofing Flaw by November 24

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Microsoft's latest Patch Tuesday included fixes for 1,259 vulnerabilities, among them CVE-2026-124194, a spoofing flaw in Outlook rated Moderate with a CVSS score of 6.5 but already flagged as actively exploited. CISA added the flaw to its Known Exploited Vulnerabilities catalog and gave federal agencies until November 24, 2026 to apply the fix. The bug lets an attacker send a crafted message file that, once opened, can make Outlook connect to an attacker-controlled network location without the usual warning, potentially exposing an NTLMv2 hash that could be used to impersonate the user. Microsoft has not attributed the exploitation to a threat actor, and it has not said whether discovery preceded or followed the attacks. Security experts have urged organizations to patch ahead of the federal deadline and to consider egress controls as an added safeguard.

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