CyberRota Analysis
AI-GeneratedNextAuth.js versions prior to @auth/core 0.41.3 and next-auth 4.24.15 and 5.0.0-beta.32 are vulnerable due to improper validation in the email and magic-link sign-in flow, allowing attackers to exploit Unicode normalization to misroute passwordless sign-in links. This critical vulnerability enables an attacker to gain unauthorized access to user accounts by intercepting sign-in links intended for victims. Organizations using these versions for authentication should prioritize updating to the patched releases to mitigate the risk of account compromise.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
NextAuth.js provides authentication for Next.js. Prior to @auth/core 0.41.3 and next-auth 4.24.15 and 5.0.0-beta.32, the defaultNormalizer used by the email and magic-link sign-in flow validates an address before applying Unicode normalization. An address can contain a Unicode character such as U+FF20 FULLWIDTH COMMERCIAL AT that is not ASCII at-sign but canonicalizes to an ASCII at-sign under NFKC or NFKD normalization. The address passes the normalizer's single-at-sign check, but a downstream sendVerificationRequest mail library or delivery service that normalizes the address can then see two at-sign separators and deliver the passwordless sign-in link to an attacker-controlled recipient. Applications are affected when the email provider uses the built-in normalizer rather than a custom normalizeIdentifier and the downstream sender applies Unicode normalization. An attacker who knows a victim's email address can request the misrouted magic link and sign in as the victim without victim interaction. This issue is fixed in @auth/core 0.41.3 and next-auth 4.24.15 and 5.0.0-beta.32.