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November 2026 Patch Tuesday: Critical Outlook and Exchange Vulnerabilities Exploited

November 2026 Patch Tuesday: Critical Outlook and Exchange Vulnerabilities Exploited

First seen 13 Nov 2026, 16:12 UTC • •
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ThreatCluster AI
ThreatCluster •November 13, 2026 at 16:13 UTC
  • •Microsoft's November Patch Tuesday addressed 1,252 CVEs, with 63 rated critical.
  • •CVE-2026-124194 and CVE-2026-118207 are actively exploited vulnerabilities in Outlook and Exchange.
  • •35% of November patches received a low reliability rating, necessitating careful prioritization.

On November 10, 2026, Microsoft released patches for 1,252 CVEs, including critical vulnerabilities in Outlook and Exchange. CVE-2026-124194, a spoofing flaw in Outlook, is, allowing attackers to leak NTLMv2 hashes. CVE-2026-118207, a critical remote code execution flaw in Exchange, poses a significant risk, especially for users on Windows Server 2019. The volume of vulnerabilities addressed this month is nearly 20 times higher than the same period last year, attributed to advancements in AI-driven vulnerability discovery. Security teams are advised to prioritize patching based on exposure and reliability ratings, as 35% of patches have a low reliability score. The urgency to patch is heightened by the potential for exploitation of these critical vulnerabilities.

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Timeline

2026-11-10
Patch Tuesday release
Microsoft released patches for 1,252 CVEs, including critical flaws in Outlook and Exchange.
Computerworld
2026-11-10
CVE-2026-124194 added to CISA KEV
CVE-2026-124194, a spoofing flaw in Outlook, was added to the CISA KEV list due to active exploitation.
Blog.Qualys
2026-11-10
CVE-2026-118207 published
CVE-2026-118207, a critical remote code execution flaw in Exchange, was disclosed.
Blog.Qualys

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Extracted Entities (70)

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Common questions

Which systems are affected by CVE-2026-124194?
CVE-2026-124194 affects Outlook, allowing attackers to exploit NTLMv2 hash disclosures.
How urgent is the patch for CVE-2026-118207?
The patch for CVE-2026-118207 is critical, as it allows remote code execution in Exchange, making immediate action necessary.
What should organizations prioritize when patching?
Organizations should prioritize patches based on exposure and reliability, focusing first on critical vulnerabilities with known exploitation.