What is CVE-2026-121665?

CVE-2026-121665 is a high-severity vulnerability in Microsoft Visual Studio Code, classified under Trust Boundary Violation. CVSS score: 8.8/10. Published 2026-11-10.

How severe is CVE-2026-121665?

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

Vulnerability in Microsoft Visual Studio Code

CVE-2026-121665

Trust boundary violation in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.

Published 2026-11-10 · last modified 2026-11-10.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L.

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

Microsoft Visual Studio Code

Weakness classification (CWE)

CWE-501 — Trust Boundary Violation

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-121665 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-121665?: CVE-2026-121665 is a high-severity vulnerability in Microsoft Visual Studio Code, classified under Trust Boundary Violation. CVSS score: 8.8/10. Published 2026-11-10.
How severe is CVE-2026-121665?: High severity. CVSS v3 base score is 8.8 out of 10.