2026-04 - 9

2026 (12)

April (12)

dotnet: Explore union types in C# 15

.NET

2026-04-02

C# 15 adds preview support for union types, letting you define a closed set of case types with implicit conversions and exhaustive pattern matching. The post also notes this fits into a broader exhaustiveness roadmap.

vscode: Insiders (version 1.111)

Visual Studio Code

2026-04-02

The provided content only includes the title and a link, without any release note details to summarize.

azure: Retirement: Python support for Azure App Service and Azure Functions on Windows will be retired on March 31, 2027

Azure Updates

2026-04-02

Python apps hosted on Azure App Service on Windows and Azure Functions on Windows will be retired on March 31, 2027. After that date, app configuration and content remain, but the apps will stop running.

azure: Retirement: AzureDnsEndpoints for Azure storage accounts will be retired March 2027

Azure Updates

2026-04-02

AzureDnsZone endpoints (preview) for Azure Blob storage accounts will be retired in March 2027. Microsoft advises moving all new and existing blob storage account deployments to Standard endpoints.

security: Threat actor abuse of AI accelerates from tool to cyberattack surface

Microsoft Security Blog

2026-04-02

Microsoft says threat actors are increasingly using generative AI to improve cyberattacks, including much higher phishing click-through rates and industrialized MFA bypass. The post frames AI as part of the attack surface, not just a tool attackers use.

security: Cookie-controlled PHP webshells: A stealthy tradecraft in Linux hosting environments

Microsoft Security Blog

2026-04-02

Microsoft describes a Linux-hosting intrusion technique where PHP webshells are triggered by specially crafted HTTP cookies. The post covers obfuscation, php-fpm execution, and cron-based persistence used to hide activity and maintain access.

github: GitHub Copilot in Visual Studio — March update

GitHub

2026-04-02

GitHub Copilot in Visual Studio got extensibility updates in the March 2026 release, including custom agents, agent skills, and new tools that improve agent capabilities.

github: The Security tab is now Security & quality

GitHub

2026-04-02

GitHub has renamed the top-level Security tab to Security & quality across repositories, organizations, and enterprises on github.com. The navigation now groups code quality findings together with security-related information.

github: Improved search for GitHub Issues is now generally available

GitHub

2026-04-02

GitHub says improved search for Issues is now generally available. It was previously in public preview and later added to the Issues dashboard.

github: Copilot organization custom instructions are generally available

GitHub

2026-04-02

GitHub Copilot organization custom instructions are now generally available. Copilot Business and Copilot Enterprise org admins can set default instructions for their organization.

azure: Retirement: Service Fabric support for Windows Server 2022 ends on March 31, 2027 - upgrade to Windows Server 2025

Azure Updates

2026-04-01

Service Fabric support for clusters running on Windows Server 2022 ends on March 31, 2027. Customers need to move to Windows Server 2025 before then to stay supported.

security: Mitigating the Axios npm supply chain compromise

Microsoft Security Blog

2026-04-01

Microsoft reports that Axios was compromised in a March 31, 2026 npm supply chain attack. Two newly published version-update packages were used to download from command-and-control infrastructure, which Microsoft Threat Intelligence attributes to the North Korean actor Sapphire Sleet.