JAY Login & Register <= 2.4.01 - Authentication Bypass via Cookie

Reliance on Cookies without Validation and Integrity Checking
CVE CVE-2025-14440
CVSS Critical (9.8)
Publicly Published December 12, 2025
Last Updated December 19, 2025
Researcher kr0d
Description

The JAY Login & Register plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 2.4.01. This is due to incorrect authentication checking in the 'jay_login_register_process_switch_back' function with the 'jay_login_register_process_switch_back' cookie value. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the user id.

References

1 affected software package

Software Type Plugin
Software Slug jay-login-register (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 2.4.01
Patched Version
  • 2.5.01
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