Buffer overflow in Microsoft 365 Apps For Enterprise

CVE-2026-80087

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to disclose information over a network.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-80087?
CVE-2026-80087 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-09-08.
How severe is CVE-2026-80087?
Medium severity. CVSS v3 base score is 6.5 out of 10.