Service Alert: Microsoft CVE- MS CVE-2026-124194 (Recovering)
Status: Recovering / monitoring · Started Nov 10, 2026, 12:00 AM PST · Microsoft’s estimate: Fix already released with Microsoft’s November 10, 2026 update; deployment is up to each customer.
Microsoft reference numbers: CVE-2026-124194, EUVD-2026-122310
Microsoft has fixed an actively exploited flaw in classic Outlook for Windows (CVE-2026-124194) that could expose a user’s Windows login hash when a crafted email file is opened. The fix is in Microsoft’s November 10, 2026 Office update, not Windows Update, so we are installing it on affected machines and will confirm when done. This is separate from the November 12 Microsoft 365 outage, which Microsoft has not linked to this flaw.
Affected: Outlook for Windows (classic), Microsoft 365 Apps for Enterprise, Office LTSC 2021, Office LTSC 2024
Latest news
Microsoft fixed CVE-2026-124194, an actively exploited Outlook spoofing flaw, in its November 10, 2026 Office security updates. Secondary reports say Windows Update does not deliver the fix, and Microsoft has not linked it to the November 12 Microsoft 365 outage.
Microsoft’s advisory describes a spoofing flaw in Outlook where the product UI does not warn users of unsafe actions, allowing an unauthenticated attacker to spoof over a network with user interaction; it is marked exploited.
Microsoft, Nov 10, 2026, 12:00 AM PST · source
Is this a hack?
Yes — the vendor or a reliable source has confirmed an attack or active exploitation.
Microsoft and CISA list the flaw as exploited, so it is being used in real attacks; a victim must open a crafted message file.
Root cause
Outlook does not show the external-content warning before connecting to an attacker-controlled network location, which can leak the user’s NTLMv2 hash.
What the IT community is saying
The posts I could find this round about CVE-2026-124194 were mostly on X, which is not an allowed source, so I left them out. The allowed-site hits were LinkedIn profile pages that repeat the points that a crafted message file leaks an NTLMv2 hash, that CISA lists the flaw as exploited with a November 24 federal deadline, and that the fix ships in Office updates rather than Windows Update. No Reddit or Bluesky thread on this CVE surfaced, and nobody on an allowed site reported a failed fix, a confirmed fix on their own machines, or a public exploit.
From public posts by IT administrators; not confirmed by the vendor.
Last 4 updates
- Nov 13, 2026, 7:16 AM PST: New: SecurityWeek reports Microsoft has not linked the flaw to the November 12 Microsoft 365 outage; a secondary guide lists a Microsoft 365 Apps build, and Splashtop says the Windows cumulative update does not carry the fix. None are confirmed by Microsoft.
- Nov 12, 2026, 10:24 PM PST: New since the last check: a CVE mirror now shows NVD as "Analyzed", CISA’s catalog gives the official vulnerability name and says ransomware use is unknown, and one aggregator claims a public exploit exists, which conflicts with Microsoft.
- Nov 12, 2026, 7:26 PM PST: Nothing major is new: a European exploitation listing (ENISA EUVD) and a Microsoft 365 Apps build-data gap, plus a conflicting CVSS score in one secondary source.
- Nov 12, 2026, 4:08 PM PST: New details since the last check: the CVE record’s CVSS vector marks exploit maturity as High, 64-bit Office editions are listed as affected, Microsoft’s exploited flag is paired with "not publicly disclosed," and a second public PoC repository is listed.
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