Vulnerability · Published Dec 13, 2025 · Assigned by Wordfence
CVE-2025-14440JAY Login & Register <= 2.4.01 - Authentication Bypass via Cookie
Critical 9.8
In plain English
A critical-severity security flaw in JAY Login & Register from jayarsiech. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| jayarsiech | JAY Login & Register | 0 – through 2.4.01 |
Weakness: CWE-565 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H