What’s Vulnerable › Vulnerabilities

CVE-2026-21257: GitHub Copilot and Visual Studio Elevation of Privilege Vulnerability

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-10 · updated 2026-08-19
• Weakness: CWE-77

Description

Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio allows an authorized attacker to elevate privileges over a network.

Affected products

• Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.26 — fixed in 17.14.26
• Microsoft Visual Studio 2026 version 18.3: from 18.3.0 before 18.3.0 — fixed in 18.3.0
• Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.26 — fixed in 17.14.26

How to fix

Upgrade to a fixed version: Microsoft Visual Studio 2022 version 17.14 17.14.26; Microsoft Visual Studio 2026 version 18.3 18.3.0; Microsoft Visual Studio 2022 version 17.14 17.14.26. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21257

Get alerted when CVE-2026-21257 or the next vulnerability affects your stack