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Ground.News • June 6, 2026

The self-replicating Miasma worm has reached Microsoft‘s own GitHub repositories. GitHub disabled 73 repositories across four Microsoft organisations, including Azure, Azure-Samples, Microsoft, and MicrosoftDocs, after the worm planted malicious code that harvests developer credentials. It is the most significant escalation yet in an ongoing supply chain attack campaign that has been spreading across the open-source […] This story continues at T…

Supply Chain Attack / MalwareMicrosoft's GitHub repositories have become the latest to fall victim

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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. 149 sources 68

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Extracted Entities

Attack Types (3)

Companies (1)

Malware (1)

MITRE ATT&CK (2)