Security & Threat Intelligence · 26.07.2026, 04:33 UTC
Defending SaaS-based applications against ShinyHunters OAuth abuse
| Schweregrad | info |
|---|---|
| Kategorie | Security & Threat Intelligence |
| Quelle | Microsoft Security Blog ↗ |
| Veröffentlicht | 26.07.2026 UTC |
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In this article
Attack chain overviewImproving visibility into Salesforce OAuth abuseMitigation and protection guidanceLearn more
In a series of campaigns observed between mid-2025 and mid-2026, Microsoft identified threat actor activity with overlapping tradecraft commonly associated with ShinyHunters, including voice phishing (vishing) and supply chain compromise, to target customer SaaS-based applications such as Salesforce instances. The threat actors abused trusted OAuth relationships for unauthorized access, data exfiltration, and persistence.
Two primary intrusion paths were observed including vishing techniques targeting OAuth consent and supply chain compromise through trusted workflows and integrations such as Salesloft and Gainsight. Abuse of these access paths led to inherited user and application privileges, allowing successful enumeration and querying of customer relationship management (CRM) records while evading conventional authentication detections. These intrusion paths often led to persistent access and exfiltration of data at scale. This tradecraft highlights how a single entry point can rapidly expand to greater enterprise impacts.
Microsoft observed activity associated with these techniques in many tenants from various industries such as retail, education and manufacturing. These findings reinforce the importance of monitoring OAuth-connected applications, validating third-party integrations, reviewing configurations, and enabling Salesforce event monitoring. Leveraging this data, Microsoft consulted with Salesforce to improve …