What is CVE-2026-85340?

CVE-2026-85340 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Use After Free. CVSS score: 7.8/10. Published 2026-10-13.

How severe is CVE-2026-85340?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Microsoft 365 Apps For Enterprise

CVE-2026-85340

Use after free in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.

Vulnerability class: Use-After-Free

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-416 — Use After Free

References

Microsoft Office Click-To-Run Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-85340?: CVE-2026-85340 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Use After Free. CVSS score: 7.8/10. Published 2026-10-13.
How severe is CVE-2026-85340?: High severity. CVSS v3 base score is 7.8 out of 10.