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CVE-2025-14440

CriticalPublished

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

Published: Dec 13, 2025
Updated: Apr 8, 2026
Assigning CNA: Wordfence
Evidence observed: Aug 11, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.8%

Low · next 30 days

Percentile: 53.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2025-14440Exploit
JAY Login & Register <= 2.4.01 - Authentication Bypass via Cookie

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