Improper Authorization in next-auth - CVE-2026-73421
Published: July 21, 2026 / Updated: August 16, 2026
Vulnerability identifier: #VU138925
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73421
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to configuration errors. A remote attacker can cause existence-based auth checks to fail open.
Affected software
next-auth
How to mitigate CVE-2026-73421
Install updates from vendor's website.
next-auth - update to 5.0.0 beta.32