What is CVE-2026-65675?

CVE-2026-65675 is a high-severity vulnerability in Microsoft GitHub Copilot Chat, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-08-11.

How severe is CVE-2026-65675?

High severity. CVSS v3 base score is 7.1 out of 10.

Auth bypass in Microsoft GitHub Copilot Chat

CVE-2026-65675

No cwe for this issue in Visual Studio Code CoPilot Chat Extension allows an unauthorized attacker to bypass a security feature over a network.

Vulnerability class: Broken Access Control

Published 2026-08-11 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L.

EPSS exploit prediction

EPSS: 0.006 (48.5th percentile), scored 2026-09-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001

Affected products

Microsoft GitHub Copilot Chat
Microsoft Visual Studio Code Copilot Chat Extension — versions 0.27.0
Microsoft Visual Studio Code

Weakness classification (CWE)

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65675 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-65675?: CVE-2026-65675 is a high-severity vulnerability in Microsoft GitHub Copilot Chat, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-08-11.
How severe is CVE-2026-65675?: High severity. CVSS v3 base score is 7.1 out of 10.