What’s Vulnerable › Vulnerabilities

CVE-2021-26434: Visual Studio Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-15 · updated 2026-08-10
• Weakness: CWE-732

Description

Visual Studio Elevation of Privilege Vulnerability

Affected products

• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8): from 15.0 through 15.9
• Microsoft Visual Studio 2019: from 16.0 through 16.11
• Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10): from 16.11.0 before 16.11.3 — fixed in 16.11.3
• Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3): from 16.0 before 16.4.26 — fixed in 16.4.26
• Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6): from 16.0.0 before 16.7.19 — fixed in 16.7.19
• Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8): from 15.0.0 before 16.9.11 — fixed in 16.9.11
• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8): from 15.9.0 before 15.9.39 — fixed in 15.9.39

How to fix

Upgrade to a fixed version: Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) 16.11.3; Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) 16.4.26; Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) 16.7.19; Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) 16.9.11; Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) 15.9.39. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26434
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26434
• https://www.zerodayinitiative.com/advisories/ZDI-21-1077/

Get alerted when CVE-2021-26434 or the next vulnerability affects your stack