ATLAS News · Technology
Microsoft says attackers are exploiting an Outlook spoofing flaw fixed in its November 10, 2026 updates, according to GBHackers News and Mezha.net.
Microsoft says attackers are actively exploiting a vulnerability in Outlook, according to Mezha.net. GBHackers News describes it as a zero-day used to steal NTLM authentication hashes.
Mezha.net reports that the flaw is an Outlook spoofing vulnerability fixed in Microsoft's security updates of November 10, 2026. The attack requires a victim to open a specially crafted message file.
Mezha.net also reports that the flaw is credited to a researcher who used Claude.
NTLM hashes are credential data used in Windows authentication, and attackers who obtain them can try to misuse them to access accounts.
Active exploitation of a flaw in a widely used Microsoft product may draw attention to the company's security update process and to its enterprise customers.
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