Read the docs
TI-2026-17164 Aliases CVE-2026-21257GHSA-g435-352v-fpxp

GitHub Copilot and Visual Studio Elevation of Privilege Vulnerability

Priority LOW 39CWE-77Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from Microsoft.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00889 59th percentileScored 2026-11-07
Fix Fixed Microsoft Visual Studio 2022 version 17.14 (Microsoft): 17.14.26Microsoft Visual Studio 2026 version 18.3 (Microsoft): 18.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Visual Studio 2022 version 17.1417.14.0 to before 17.14.2617.14.26Patch availableCNA
MicrosoftMicrosoft Visual Studio 2026 version 18.318.3.0 to before 18.3.018.3.0Patch availableCNA
  • Microsoft Visual Studio 2022 version 17.14 VendorMicrosoft Affected 17.14.0 to before 17.14.26 Fixed in 17.14.26 Patch available CNA
  • Microsoft Visual Studio 2026 version 18.3 VendorMicrosoft Affected 18.3.0 to before 18.3.0 Fixed in 18.3.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:-:*:*17.14.0 to before 17.14.26VulnerableMicrosoft
  • cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:-:*:* Versions 17.14.0 to before 17.14.26 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Visual Studio 2022 version 17.14 (Microsoft) Fixed in 17.14.26
  • Fix · CNA Microsoft Visual Studio 2026 version 18.3 (Microsoft) Fixed in 18.3.0

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Elevation of Privilege
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft Visual Studio 2022 version 17.14Fixed 17.14.26 · Security Update
Microsoft Visual Studio 2026 version 18.3Fixed 18.3.0 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21257
  2. 2026-10-03 Alias added: GHSA-g435-352v-fpxp

References

Patch 1

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-19596 .NET and Visual Studio Denial of Service Vulnerability KEVCVSS 3.1HIGH 7.5
  • TI-2025-34970 ASP.NET Security Feature Bypass Vulnerability CVSS 3.1CRITICAL 9.9
  • TI-2023-19588 Microsoft QUIC Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2024-19132 Microsoft ODBC Driver for SQL Server Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
  • TI-2022-16266 Visual Studio Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
See all 155 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences