Description
Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Affected products
microsoft: 365 apps; microsoft: office 2021; microsoft: office 2024
References1
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-100208 Vendor Advisory
Metrics
- CVSS 3.1
-
8.1
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 39 · as of 9 November 2026
- CWE
- CWE-122CWE-190
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.