Will an OAuth grant-abuse breach compromise 100+ corporate accounts by year-end 2026?

OAuth grants create data highways between SaaS apps, AI agents, and other tools and are multiplying faster than security teams can review them. The recent Klue breach exemplified attackers exploiting forgotten OAuth grants to gain access to corporate data (Bleeping Computer). As AI agents and SaaS integrations proliferate, unreviewed OAuth permissions represent an expanding attack surface.

Resolution Criteria

Resolved YES if a vendor, CISA alert, or major security firm reports a documented breach in which attackers exploited neglected/forgotten OAuth grants to compromise 100+ corporate user accounts. Sources: vendor breach disclosures, CISA alerts, SecurityWeek, Bleeping Computer, or Gartner security reports.