CRITICAL 9.1 Microsoft

CVE-2026-34182

CMS AuthEnvelopedData Processing May Accept Forged Messages

Microsoft Security Update 2026-Sep: CMS AuthEnvelopedData Processing May Accept Forged Messages

Affected Products

Microsoft Visual Studio 2022 version 17.14
Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
azl3 edk2 20240524git3e722403cd16-17 on Azure Linux 3.0
azl3 openssl 3.3.5-5 on Azure Linux 3.0
Microsoft Visual Studio 2026 version 18.9

References

Published: 2026-09-08 · Source: Microsoft · Feed updated: 2026-09-18

This critical severity vulnerability with a CVSS score of 9.1 was published on 2026-09-08 via Microsoft. Affected: Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10), Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) and 3 more.

Risk Timeline

CVE Disclosed2026-09-08 · 9 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34182

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2026-34182

Related Vulnerabilities

CVE	Title	Severity	CVSS
CVE-2026-83711	Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability	CRITICAL	10.0
CVE-2025-55241	Azure Entra ID Elevation of Privilege Vulnerability	CRITICAL	10.0
CVE-2026-63508	Microsoft Planetary Computer Pro Elevation of Privilege Vulnerability	CRITICAL	10.0
CVE-2026-65667	Microsoft Teams Elevation of Privilege Vulnerability	CRITICAL	10.0
CVE-2026-65801	Microsoft Exchange Online Elevation of Privilege Vulnerability	CRITICAL	10.0
CVE-2026-69836	Microsoft Entra ID Remote Code Execution Vulnerability	CRITICAL	10.0

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