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VulnerabilitiesNov 10, 2026

November Patch Tuesday boasts over 1,000 bugs but only one zero-day so far

Microsoft Patch Tuesday fixes 1,094 bugs, including one actively exploited zero-day in Outlook.

Microsoft's November Patch Tuesday addresses 1,094 vulnerabilities, with CVE-2026-124194, an Outlook spoofing flaw, being the sole actively exploited zero-day. Despite its moderate CVSS score, this vulnerability allows attackers to steal NTLMv2 hashes by tricking users into opening specially crafted messages. The release also includes two critical zero-click threats, CVE-2026-116928 and CVE-2026-119958, impacting Windows Search Component and Exchange.

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The lesson from this incident

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Microsoft's November Patch Tuesday addressed 1,094 vulnerabilities, including an actively exploited Outlook spoofing flaw (CVE-2026-124194) that allows attackers to steal NTLMv2 hashes simply by tricking users into opening a crafted email message. Despite carrying only a moderate CVSS score, the real-world exploitation of this flaw demonstrates that severity ratings alone should not dictate patching priority. Two additional zero-click critical vulnerabilities in Windows Search and Exchange compound the risk, requiring no user interaction to exploit. Organizations that delay applying Patch Tuesday updates leave themselves exposed to credential theft and potential lateral movement across their networks.

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Indicators of Compromise

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  • cve — CVE-2026-124194
  • cve — CVE-2026-116928
  • cve — CVE-2026-119958

Entities

Microsoft (vendor)Outlook (product)Exchange (product)NTLMv2 (technology)