CVE-2026-100208

Published: Sep 25, 2026Modified: Oct 20, 2026

8.1

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 2.2 / Impact: 5.9

Source: NVD

Description

Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

Affected (6)

Products: Microsoft: 365 Apps, Office 2021, Office 2024

3 products

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Microsoft 365 Apps	All versions
Microsoft 365 Apps	All versions
Microsoft Office 2021	All versions
Microsoft Office 2021	All versions
Microsoft Office 2024	All versions
Microsoft Office 2024	All versions

Related CWEs

Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-100208

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.