What is CVE-2026-44818?

CVE-2026-44818 is a high-severity vulnerability, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.0/10. Published 2026-06-09.

How severe is CVE-2026-44818?

High severity. CVSS v3 base score is 7.0 out of 10.

CVE-2026-44818

CVE-2026-44818

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Vulnerability class: Race Condition

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

secure@microsoft.com

Frequently asked questions

What is CVE-2026-44818?: CVE-2026-44818 is a high-severity vulnerability, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.0/10. Published 2026-06-09.
How severe is CVE-2026-44818?: High severity. CVSS v3 base score is 7.0 out of 10.