Record / data breach · United States · 2020-07-20

Microsoft AI researchers' overbroad storage token exposed internal data on GitHub

data breachAI eraconfidence 95named

A Microsoft researcher published a blob storage URL carrying an overly permissive SAS token in a public GitHub repository used to share open-source AI models. The token opened a storage account holding backups of two former employees' workstation profiles and internal Teams messages. Wiz reported it on June 22, 2023 and Microsoft revoked the token two days later. Microsoft says no customer data was exposed; Wiz put the exposed data at about 38 TB.

Organization
Microsoft · microsoft.com
Country · sector
United States · Technology
Dates
occurred 2020-07-20 · disclosed 2023-09-18 · published 2026-09-26
Tags
data-exposure, ai-supply-chain, ai-era

Sources

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A data breach sits in these classes of the AI-security landscape. The companies below work on that class of problem. This is a taxonomy, not a claim that any of them would have changed this incident.

HeimWall Operator
AI data governance
United States · est. 2025
AI posture (CSPM)AI identityModel security
Israel · est. 2023 · raised $132M
AI posture (CSPM)AI identity
Israel · est. 2022 · raised $430M
AI data governance
United States · est. 2025
AI data governanceAI identity
Israel · est. 2025 · raised $30M

Vendor data: AI Security Startups Map by Prompt Security (CC BY 4.0), synced daily. startups.prompt.security. Paid placements are labelled Sponsored; HeimWall, which runs this site, is labelled Operator. 452 companies in the directory.

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