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CVE-2026-20965 is a high-severity privilege-escalation vulnerability in the Azure Single Sign-On implementation of Microsoft Windows Admin Center. The flaw stems from improper verification and binding of authorization artifacts used during Windows Admin Center access to Azure virtual machines and Azure Arc-connected systems. In the affected design, a WAC.CheckAccess token and a proof-of-possession token are accepted without sufficient cross-validation, including failure to enforce identity consistency between tokens and acceptance of insufficiently validated proof-of-possession token attributes. Reported weaknesses include lack of required matching between user principal information across the tokens, acceptance of proof-of-possession material originating from a different tenant, and overly broad authorization scope for the access token. As a result, an attacker who can capture a valid access token from a privileged session and pair it with attacker-controlled proof-of-possession material can impersonate authorized access to other Windows Admin Center-managed resources within the same tenant. The issue affects Windows Admin Center Azure Extension versions prior to 0.70.00.
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One of four vulnerabilities affecting Microsoft's Windows Admin Center (WAC), discussed as enabling cross-boundary attacks between on-prem and Azure-managed environments in hybrid cloud deployments.
Improper token validation/access scoping issue in Windows Admin Center Azure Extension that can enable tenant-wide remote code execution in Azure contexts.
Unknown
Improper token validation in Windows Admin Center (WAC) Azure SSO that allows an attacker to mix a stolen WAC.CheckAccess token with a forged Proof-of-Possession (PoP) token, enabling cross-machine/tenant lateral movement and unauthorized access across Azure tenants (including Azure VMs and Arc-connected systems).
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Cross-references every affected SKU, including bundled OEM variants.
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