Incorrect Behavior Order: Validate Before Canonicalize in next-auth - #VU138941
Published: July 21, 2026
Vulnerability identifier: #VU138941
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: N/A
CWE-ID: CWE-180
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: NextAuth.js
Affected software:
next-auth
next-auth
Detailed vulnerability description
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to default email-address normalizer validates the address before applying Unicode normalization. A remote attacker can gain access to the target system.
Remediation
Install updates from vendor's website.