CVE-2024-3726 is a stored cross-site scripting vulnerability in the Login Logout Register Menu WordPress plugin by vinod-dalvi. It affects all versions up to and including 2.0. The vulnerability is due to improper neutralization of input during web page generation (CWE-79), specifically insufficient sanitization and escaping of user-supplied attributes in the 'llrmloginlogout' shortcode. Authenticated users with contributor-level permissions or higher can inject arbitrary scripts that execute in the context of other users visiting the injected pages. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N, reflecting network attack vector, low attack complexity, low privileges required, no user interaction, scope changed, and limited confidentiality and integrity impact without availability impact.

An attacker with contributor-level or higher privileges can inject persistent malicious scripts into pages using the vulnerable shortcode. These scripts execute in the browsers of users who visit the compromised pages, potentially leading to session hijacking, privilege escalation, or other client-side attacks. The vulnerability affects confidentiality and integrity but does not impact availability. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the vulnerable plugin. Monitor for updates from the vendor or plugin author regarding patches or official mitigations.