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OAuth hijacked: How a third-party breach hit Vercel

ID: 317b195e-b44e-57ab-a5dd-0e4edcdbe646

STIX ID: report--317b195e-b44e-57ab-a5dd-0e4edcdbe646

Feed Name: Expel Blog

Threat Score
75/100

Date Published: 2026-04-20

Date Updated: 2026-04-27

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On April 19 Vercel disclosed that attackers leveraged a compromised Context AI OAuth grant to access and exfiltrate data; the report notes the abused OAuth client ID was published and recommends hunting for the client ID, auditing OAuth consent grants, and restricting third-party app permissions.

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