What is CVE-2026-78453?

CVE-2026-78453 is a medium-severity vulnerability in Microsoft Windows 10 1607, classified under Integer Underflow. CVSS score: 6.5/10. Published 2026-09-08.

How severe is CVE-2026-78453?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Integer overflow in Microsoft Windows 10 1607

CVE-2026-78453

Integer underflow (wrap or wraparound) in Microsoft Windows SCSI Class System File allows an unauthorized attacker to disclose information over a network.

Published 2026-09-08 · last modified 2026-09-24.

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.

EPSS exploit prediction

EPSS: 0.009 (60.0th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

Microsoft Windows SCSI Class System File Information Disclosure Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-78453?: CVE-2026-78453 is a medium-severity vulnerability in Microsoft Windows 10 1607, classified under Integer Underflow. CVSS score: 6.5/10. Published 2026-09-08.
How severe is CVE-2026-78453?: Medium severity. CVSS v3 base score is 6.5 out of 10.