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Miasma Worm Compromises 73 Microsoft GitHub Repositories

Securityaffairs.Co •Pierluigi Paganini • June 9, 2026

The Miasma worm compromised 73 Microsoft GitHub repos, spreading via AI coding tools and stealing cloud credentials from developers and CI/CD systems. A self-replicating worm called Miasma has compromised 73 Microsoft GitHub repositories and forced GitHub staff to disable them. The affected repos include core Azure infrastructure like azure-functions-host and the entire Durable Task family […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

GitHub Breach: 3,800 Internal Repositories Compromised via Malicious VS Code Extension On May 20, 2026, GitHub confirmed a significant security breach involving a poisoned Visual Studio Code (VS Code) extension that compromised an employee's device. The attack, attributed to the TeamPCP hacking group, resulted in the exfiltration of approximately 3,800 internal repositories. GitHub's initial assessment indicated that the breach did not affect customer data stored outside its internal systems. The malicious extension was promptly removed, and GitHub initiated an incident response, including credential rotation. TeamPCP is reportedly offering the stolen data for sale on cybercrime forums, demanding at least $50,000. The breach highlights vulnerabilities in developer tools and the potential for significant impacts on software supply chains. GitHub is continuing to monitor for any follow-on activity as the investigation progresses. 111 sources 68

Extracted Entities

Miasma Worm Compromises 73 Microsoft GitHub Repositories

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Extracted Entities

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