What is CVE-2026-68831?

CVE-2026-68831 is a medium-severity vulnerability in Microsoft Windows 10 1607, classified under Files or Directories Accessible to External Parties. CVSS score: 5.5/10. Published 2026-09-08.

How severe is CVE-2026-68831?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Microsoft Windows 10 1607

CVE-2026-68831

Files or directories accessible to external parties in Windows Defender Firewall Service allows an authorized attacker to disclose information locally.

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

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.6th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

Windows Defender Firewall Service Information Disclosure Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-68831?: CVE-2026-68831 is a medium-severity vulnerability in Microsoft Windows 10 1607, classified under Files or Directories Accessible to External Parties. CVSS score: 5.5/10. Published 2026-09-08.
How severe is CVE-2026-68831?: Medium severity. CVSS v3 base score is 5.5 out of 10.