This vulnerability (CVE-2026-26148) in Microsoft Azure AD SSH Login extension for Linux (version 1.0.0) is classified as CWE-454: External Initialization of Trusted Variables or Data Stores. It allows an unauthorized local attacker to elevate privileges by manipulating trusted variables or data stores during initialization. The CVSS 3.1 base score is 8.1, indicating high severity with complex attack conditions (local attack vector, high attack complexity, no privileges required, no user interaction, scope changed, and high impacts on confidentiality, integrity, and availability). Microsoft has released an official fix and manages remediation for this cloud-hosted service. The vendor advisory is available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26148.

An unauthorized local attacker could exploit this vulnerability to elevate privileges, potentially gaining full control over the affected system. The vulnerability impacts confidentiality, integrity, and availability at a high level. Since the product is a cloud service, exploitation could affect cloud-hosted environments relying on this extension for SSH login.

An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users should consult the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26148 for detailed guidance and ensure their environments are updated accordingly.