Security vulnerabilities and automated fixes for email bypass issues
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CVE-2026-73420 is a critical authentication bypass vulnerability in Auth.js (next-auth) where the email normalizer validates an address before applying Unicode normalization, allowing an attacker to craft an email containing a Unicode homoglyph that looks like "@" to slip past validation and impersonate another user. The fix upgrades next-auth from 4.24.13 to 4.24.15 (and 5.0.0-beta.32 for the beta line), ensuring normalization happens before validation so lookalike characters are resolved to th