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Verification
VERIFIEDConfidence: HIGH
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Fact-check summary

NVD and cve.report confirm the Outlook integer overflow RCE CVE-2026-100208 published September 25 with 7.5 CVSS score.

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Home/Tech/Microsoft Outlook Flaw CVE-2026-100208 Could Allow Remote Code Execution
VERIFIEDBy Xavier Rivera· ·1 min read

Microsoft Outlook Flaw CVE-2026-100208 Could Allow Remote Code Execution

Microsoft Office Outlook has an integer overflow flaw, CVE-2026-100208, that could let an unauthorized attacker run code over a network. Microsoft scores it 7.5 (High), and an attack needs user interaction.

Source:NVD
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Microsoft Outlook Flaw CVE-2026-100208 Could Allow Remote Code Execution
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TL;DRAI · 60 sec read

NVD published CVE-2026-100208 on September 25, an integer overflow flaw in Microsoft Office Outlook that could let an unauthorized attacker execute code over a network. Microsoft, the assigning CNA, scores it 7.5 (High) on CVSS 3.1; the vector requires user interaction and rates attack complexity as high. The record does not name affected versions or a fix.

An integer overflow vulnerability in Microsoft Office Outlook could allow remote code execution, letting an unauthorized attacker run code over a network. NVD published the record, CVE-2026-100208, on September 25.
An attacker can execute code over a network.
Microsoft scores the Outlook bug 7.5, rated High. The CVSS 3.1 score comes from Microsoft as the CNA that assigned the CVE. Its vector says an attack works over the network without any privileges, but it needs the victim to interact and is rated high in complexity.

The root cause is an integer overflow or wraparound. NVD files the weakness under CWE-190. If an attack succeeds, the vector rates the impact on confidentiality, integrity and availability as high.
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Microsoft's Security Update Guide holds the vendor entry. The NVD record links to Microsoft's page for CVE-2026-100208. The record does not name affected Outlook versions or a fix, and it says nothing about exploitation. NVD has not finished its own analysis of the entry.

EXPERT TAKE

Administrators should review the MSRC advisory for patch availability and test deployment in Outlook environments.

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