Microsoft November 2026 Patch Tuesday fixes 1093 CVEs, one exploited
Outlook spoofing CVE-2026-124194, used as a zero-day, leaks NTLMv2 hashes when a crafted Office file is opened.
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CVE-2026-118207
Authenticated remote code execution in Exchange Server
- CVSS 3.1
- 8.8 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
Improper input validation in Microsoft Exchange Server lets an attacker who already has valid credentials run code over the network, with no user interaction. Successful exploitation yields high impact on confidentiality, integrity, and availability of the server. Microsoft has not listed affected builds or a fixed version for this flaw.
What to do: Apply Microsoft's update for CVE-2026-118207. No workaround is named.
| Product | Affected |
|---|---|
| Microsoft Exchange Server | — |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
Improper input validation in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
- Weakness
- CWE-706
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
In the news
3 storiesZDI lists November 2026 Microsoft fixes, one Outlook bug exploited
CVE-2026-124194 is the only listed flaw marked exploited; it is a Moderate CVSS 6.5 spoofing bug.
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Microsoft November 2026 update fixes 1,093 flaws, one Outlook zero-day
Opening a crafted file can leak an NTLMv2 hash; the Preview Pane is not an attack vector.
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