Actively exploited Outlook spoofing flaw patched
Microsoft patched CVE-2026-124194, an actively exploited Outlook spoofing vulnerability; IPA urges immediate patching of November 2026 Patch Tuesday updates.
Sourceipa.go.jp — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-124194 as exploited in the wild.
IPA's monthly advisory covers Microsoft's November 2026 Patch Tuesday security updates, highlighting CVE-2026-124194, a Microsoft Outlook spoofing vulnerability described as a missing user-interaction-for-potentially-unsafe-action flaw. Microsoft has confirmed this vulnerability is being actively exploited in the wild, and it has been added to CISA's Known Exploited Vulnerabilities (KEV) catalog. Exploitation of the broader set of November patches could lead to application crashes or full attacker control of affected machines.
IPA recommends organizations prioritize applying this month's security updates as soon as possible via Windows Update or managed patch deployment processes, noting that a reboot may be required. This is a routine monthly vulnerability advisory from IPA summarizing Microsoft's own Patch Tuesday release, elevated in urgency due to the confirmed in-the-wild exploitation of the Outlook spoofing bug.
Mentioned in this report
Source reporting: https://www.ipa.go.jp/security/security-alert/2026/1111-ms.html
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