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TI-2021-08251 Aliases CVE-2021-26434GHSA-8qhp-jq8m-c4m4

Visual Studio Elevation of Privilege Vulnerability

Priority LOW 36CWE-732Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
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

Visual Studio Elevation of Privilege Vulnerability

Why it matters now

EPSS 0.00892 59th percentileScored 2026-11-07
Fix Fixed Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) (Microsoft): 15.9.39Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) (Microsoft): 16.11.3+3 more products

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)15.9.0 to before 15.9.3915.9.39Patch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)16.11.0 to before 16.11.316.11.3Patch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)16.0 to before 16.4.2616.4.26Patch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)16.0.0 to before 16.7.1916.7.19Patch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)15.0.0 to before 16.9.1116.9.11Patch availableCNA
  • Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) VendorMicrosoft Affected 15.9.0 to before 15.9.39 Fixed in 15.9.39 Patch available CNA
  • Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) VendorMicrosoft Affected 16.11.0 to before 16.11.3 Fixed in 16.11.3 Patch available CNA
  • Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) VendorMicrosoft Affected 16.0 to before 16.4.26 Fixed in 16.4.26 Patch available CNA
  • Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) VendorMicrosoft Affected 16.0.0 to before 16.7.19 Fixed in 16.7.19 Patch available CNA
  • Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) VendorMicrosoft Affected 15.0.0 to before 16.9.11 Fixed in 16.9.11 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*15.0 – 15.9VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*16.0 – 16.11VulnerableMicrosoft
  • cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:* Versions 15.0 – 15.9 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:* Versions 16.0 – 16.11 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) (Microsoft) Fixed in 15.9.39
  • Fix · CNA Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) (Microsoft) Fixed in 16.11.3
  • Fix · CNA Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) (Microsoft) Fixed in 16.4.26
  • Fix · CNA Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) (Microsoft) Fixed in 16.7.19
  • Fix · CNA Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) (Microsoft) Fixed in 16.9.11

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 2017 version 15.9 (includes 15.0 - 15.8)Fixed 15.9.39 · Security Update
Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)Fixed 16.11.3 · Security Update
Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)Fixed 16.4.26 · Security Update
Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)Fixed 16.7.19 · Security Update
Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)Fixed 16.9.11 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-26434
  2. 2026-10-03 Alias added: GHSA-8qhp-jq8m-c4m4

References

Patch 2

Advisory 1

  • TI-2020-01112 A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and… KEVCVSS 3.1HIGH 7.8
  • TI-2022-16266 Visual Studio Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
  • TI-2021-15028 Visual Studio Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2019-01063 Improper input validation in Microsoft Visual Studio 2017 version 15.9 CVSS 3.1HIGH 8.8
  • TI-2019-01064 Improper input validation in Microsoft Visual Studio 2019 version 16.4 CVSS 3.1HIGH 8.8
  • TI-2019-01066 Improper input validation in Microsoft Visual Studio 2019 version 16.4 CVSS 3.1HIGH 8.8
See all 93 →

Sources

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