Collected research
nOAuth: How Microsoft OAuth Misconfiguration Can Lead to Full Account Takeover
Azure AD lets a tenant admin set an arbitrary, unverified email address on a user, and that value is emitted as the email claim in the OpenID Connect token. Any application that identifies users by the email claim instead of the sub claim, or that merges accounts on a matching email, can be fully taken over: the attacker sets a victim's address in their own tenant and signs in with Log in with Microsoft.
Record
- Researcher
- Omer Cohen
- Published by
- Descope
- Topic
- Identity
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This page is the archive's own catalogue record. The research is the work of Omer Cohen, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on .