CVE-2026-21256

Published: Feb 10, 2026

Modified: May 11, 2026

PUBLISHED

CVSS v3.1

8.8

HIGH

Description

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

Vendor	Product	Versions
Microsoft	Microsoft Visual Studio 2022 version 17.14	affected `17.14.0 - < 17.14.26`
Microsoft	Microsoft Visual Studio 2026 version 18.3	affected `18.3.0 - < 18.3.0`

Weaknesses (CWE)

CWE-77

CWE-94

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

GitHub Copilot and Visual Studio Remote Code Execution Vulnerability

vendor-advisory

patch

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CVE-2026-21256

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References