CVE-2026-21257

Name: CVE-2026-21257
Creator: NVD / NIST
Published: 2026-02-10T18:16:27.483+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2026-21257 is a high-severity vulnerability rated 8/10 on the CVSS scale. 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.. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8/10

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

EPSS Probability

0.84%

53.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-77

Affected Software

Vendor	Product	Versions
Microsoft	Visual Studio 2022	>= 17.14.0, < 17.14.26

References

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

Timeline

Published: Feb 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21257?

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.

How severe is CVE-2026-21257?

CVE-2026-21257 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21257?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21257?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST