Stop Trusting the OAuth Email: How One Missing Check Enables Account Takeover in 2026

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Explore OAuth Verification Trust Mismatch, a security issue caused by mismatch between OAuth providers and client applications
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OAuth Verification Trust Mismatch vulnerabilities can arise when a client application incorrectly assumes an email address is verified based on an OAuth provider's authentication response, potentially leading to account takeover, blind linking, and other security issues.