CVE-2025-13740 is a stored cross-site scripting vulnerability in the Lightweight Accordion WordPress plugin (versions up to 1.5.20). The issue arises from improper neutralization of input during web page generation, specifically in the plugin's `lightweight-accordion` shortcode attributes. Authenticated attackers with contributor or higher privileges can inject arbitrary scripts that execute in the context of users viewing the compromised pages. This vulnerability is classified under CWE-79 and has a CVSS 3.1 base score of 6.4, indicating medium severity. No known exploits in the wild have been reported, and no patch or remediation details are provided in the available data.

Successful exploitation allows an authenticated user with contributor-level access or higher to inject and store malicious scripts within pages using the Lightweight Accordion shortcode. These scripts execute in the browsers of users who view the infected pages, potentially leading to session hijacking, defacement, or other client-side impacts. The vulnerability does not affect availability and has limited impact on confidentiality and integrity as per the CVSS vector.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the Lightweight Accordion plugin if possible to prevent exploitation.