What is CVE-2026-108398?

CVE-2026-108398 is a high-severity vulnerability in Microsoft .Net Framework 3.5 And 4.6.2/4.7/4.7.1/4.7.2, classified under Untrusted Search Path. CVSS score: 8.8/10. Published 2026-10-13.

How severe is CVE-2026-108398?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Microsoft .Net Framework 3.5 And 4.6.2/4.7/4.7.1/4.7.2

CVE-2026-108398

Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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-426 — Untrusted Search Path

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108398 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-108398?: CVE-2026-108398 is a high-severity vulnerability in Microsoft .Net Framework 3.5 And 4.6.2/4.7/4.7.1/4.7.2, classified under Untrusted Search Path. CVSS score: 8.8/10. Published 2026-10-13.
How severe is CVE-2026-108398?: High severity. CVSS v3 base score is 8.8 out of 10.