nOAuth-ing to see here. [Research Saturday]

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3347 of 3362
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This week, we are joined by Eric Woodruff, Chief Identity Architect at Semperis, discussing "nOAuth Abuse Alert: Full Account Takeover of Entra Cross-Tenant SaaS Applications". Semperis researchers identified a critical authentication flaw known as nOAuth in 9 out of 104 tested SaaS applications integrated with Microsoft Entra ID.

This low-complexity but severe vulnerability allows attackers with just a user’s email address and access to an Entra tenant to impersonate users, exfiltrate data, and move laterally within affected apps—with no viable defense or detection available to customers. The findings spotlight ongoing risks tied to improper use of email claims in authentication and emphasize the urgent need for SaaS vendors to adopt secure OpenID Connect practices and remediate vulnerable applications.

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The research can be found here:

nOAuth Abuse Alert: Full Account Takeover of Entra Cross-Tenant SaaS Applications

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