GitHub Internal Repositories Breached by TeamPCP via Malicious VS Code Extension
GitHub confirmed that approximately 3,800 internal repositories were breached due to a malicious Visual Studio Code extension installed on an employee's device. The attack was attributed to a hacking group known as TeamPCP. While GitHub stated that customer repositories and production systems remained secure, the incident highlighted concerns over software supply-chain integrity and developer platform security. TeamPCP is also reportedly responsible for compromising over 400 package versions across multiple open-source platforms like npm and PyPI.
Signal context
First seen: May 26, 2026
Last updated: Jun 26, 2026
Status: Public signal
Key points
- Disclosed on May 26, 2026.
- Breach of approximately 3,800 internal GitHub repositories.
- Caused by a malicious Visual Studio Code extension installed on an employee's device.
Signal analysis
BetaThis analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Sector: Information
Likely country: Location not provided
The feed marks multiple actor roles. Treat this as a review signal rather than a final attribution.
- Source type: outside the affected organization
- Source type: possible insider or internal misuse
Impact area: Confidentiality, Integrity
Likely asset: User or customer data
- 29 signals in the same sector
- 93 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
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