What the vulnerability does
01Description
The login_register plugin for WordPress is vulnerable to Cross-Site Request Forgery to Stored Cross-Site Scripting in all versions up to, and including, 1.2.0. This is due to missing nonce validation on the settings page and insufficient input sanitization and output escaping on the 'login_register_login_post' parameter. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page via a forged request granted they can trick an administrator into performing an action such as clicking on a link.
Explanation of Vulnerability in Simple Terms
02Summary
The login_register plugin for frankkoenen contains a cross-site request forgery (CSRF) vulnerability in versions up to 1.2.0. An attacker can craft a malicious webpage that, when visited by a logged-in site administrator, performs unwanted actions on the site without their knowledge. The vulnerability requires user interaction and does not expose sensitive data, but can modify site settings or user accounts.
What an attacker can do
03Attacker Capabilities
Trick a site admin into visiting a malicious page that performs unwanted actions on the site without their consent.
Potential impact on your site
04Site Impact
Unauthorized changes to site settings, user accounts, or plugin configuration if an admin visits a malicious link.
Conditions required to exploit
05Prerequisites
Site admin must visit an attacker-controlled webpage while logged into the site.
Key dates
06Disclosure timeline
March 21, 2026
CVE published
April 8, 2026
Record updated
