CVE-2026-100208
Microsoft Office Outlook Remote Code Execution Vulnerability
Microsoft Microsoft 365 Apps for EnterpriseApplications & CMS
CVSS
7.5HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.34%Chance of exploitation activity in the next 30 days, higher than 26% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Text from CVE List
Affected versions 3
- Microsoft 365 Apps for Enterpriseaffected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
- Microsoft Office LTSC 2021affected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
- Microsoft Office LTSC 2024affected: 16.0.0 before https://aka.ms/OfficeSecurityReleasesCVE List