What is CVE-2026-70300?

CVE-2026-70300 is a critical-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Untrusted Pointer Dereference. CVSS score: 9.8/10. Published 2026-10-13.

How severe is CVE-2026-70300?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Microsoft 365 Apps For Enterprise

CVE-2026-70300

Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/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-822 — Untrusted Pointer Dereference

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70300 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-70300?: CVE-2026-70300 is a critical-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Untrusted Pointer Dereference. CVSS score: 9.8/10. Published 2026-10-13.
How severe is CVE-2026-70300?: Critical severity. CVSS v3 base score is 9.8 out of 10.