What the vulnerability does
01Description
The Admin Custom Login plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 3.6.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Explanation of Vulnerability in Simple Terms
02Summary
Admin Custom Login versions 3.6.4 and earlier contain a cross-site scripting vulnerability in the login page. An attacker with high-level site privileges can inject malicious scripts that execute in the browsers of other administrators. The vulnerability has limited scope but can compromise admin account security and site integrity.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other administrators' browsers when they access the login page.
Potential impact on your site
04Site Impact
Administrators visiting the login page may have their sessions hijacked or credentials stolen by injected scripts.
Conditions required to exploit
05Prerequisites
Attacker must have high-level site privileges (admin or equivalent) and the vulnerable plugin must be active.
Key dates
06Disclosure timeline
August 16, 2026
CVE published
