What is CVE-2026-47635?

CVE-2026-47635 is a high-severity vulnerability in Microsoft Office Ltsc 2024, classified under Heap-based Buffer Overflow. CVSS score: 8.4/10. Published 2026-06-09.

How severe is CVE-2026-47635?

High severity. CVSS v3 base score is 8.4 out of 10.

Buffer overflow in Microsoft Office Ltsc 2024

CVE-2026-47635

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Vulnerability class: Buffer Overflow

Published 2026-06-09 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.1th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Microsoft Office Ltsc 2024 — versions 16.0.0
Microsoft Office 2024

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

Microsoft Outlook and Word Remote Code Execution Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-47635?: CVE-2026-47635 is a high-severity vulnerability in Microsoft Office Ltsc 2024, classified under Heap-based Buffer Overflow. CVSS score: 8.4/10. Published 2026-06-09.
How severe is CVE-2026-47635?: High severity. CVSS v3 base score is 8.4 out of 10.