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Vulnerabilities

Vulnerability · 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 n

Published Feb 10, 2026 · catalog updated Aug 19, 2026 · Microsoft Microsoft Visual Studio 2026 version 18.3

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-21257. EPSS is 0.90%. Act only if a listed version of Microsoft Microsoft Visual Studio 2026 version 18.3 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.90%
Remediation
Version ranges on file
Affected products
vendor Microsoft Microsoft Visual Studio 2026 version 18.3 18.3.0 <18.3.0

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Microsoft Visual Studio 2026 version 18.3 18.3.0 <18.3.018.3.0 <18.3.0

How to fix CVE-2026-21257

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-21257. EPSS is 0.90%. Act only if a listed version of Microsoft Microsoft Visual Studio 2026 version 18.3 is installed.

Which versions are affected?

Compare what you have installed with Microsoft Microsoft Visual Studio 2026 version 18.3 18.3.0 <18.3.0 18.3.0 <18.3.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.90%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 10, 2026 · EUVD

    Detected

    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.

  2. Aug 19, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-21257

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-21257

    30-day exploitation probability 0.90%

    first.org
  • EUVDVulnerability recordEUVD-2026-7327

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026