CVE-2026-100208
highInteger overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Vendor / product: Microsoft — 365 apps
Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
CVSS
8.1
8.1 (CVSS v3.1)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-25 20:17
Modified: 2026-10-28 21:16
NVD status: Modified
Last synced 10 hours ago
Verified against the source API 2026-10-28 22:10 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
microsoft / 365_apps all versions
microsoft / office_2021 all versions
microsoft / office_2024 all versions
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-100208 secure@microsoft.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-28 22:10 UTC · record ↗