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Microsoft Patches Outlook Vulnerability CVE-2026-124194

Microsoft Patches Outlook Vulnerability CVE-2026-124194

First seen 11 Nov 2026, 17:03 UTC • •
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ThreatCluster AI
ThreatCluster •November 11, 2026 at 17:09 UTC
  • •CVE-2026-124194 in Outlook is actively exploited, allowing unauthorized access.
  • •Microsoft's November update fixed over 1,000 vulnerabilities, including this one.
  • •Affected systems include Microsoft 365 Apps for Enterprise and Office LTSC versions.

On November 10, 2026, Microsoft released its monthly security updates, addressing over 1,000 vulnerabilities, including a flaw in Outlook identified as CVE-2026-124194. This vulnerability is being, allowing attackers to authenticate as victims by sending a specially crafted email that connects Outlook to an attacker's server without the usual warning. Affected systems include Microsoft 365 Apps for Enterprise, Office LTSC 2021, and Office LTSC 2024, while Office 2016 and 2019 are not impacted due to their end of support. The flaw is classified as medium severity with a CVSS score of 6.5. Microsoft has not provided detailed information on the nature of the attacks but confirmed that the vulnerability is already being targeted. The update is part of a broader patch cycle that addressed a total of 1,093 vulnerabilities, 63 of which were classified as.

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Timeline

2026-11-10
Microsoft releases November security updates
Microsoft patched over 1,000 vulnerabilities, including CVE-2026-124194 in Outlook, which is actively exploited.
T-Online
2026-11-11
CVE-2026-124194 first public PoC
Proof of concept for CVE-2026-124194 was made public, highlighting the exploit method.
Notebookcheck

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Common questions

Which versions of Outlook are affected?
Microsoft 365 Apps for Enterprise, Office LTSC 2021, and Office LTSC 2024 are affected; Office 2016 and 2019 are not.
What is the nature of the exploitation?
Attackers send a crafted email that allows Outlook to connect to their server without warnings, enabling unauthorized authentication.
How urgent is the patching process?
Given the active exploitation of CVE-2026-124194, it is critical to apply the updates as soon as possible.