CVE-2025-13678 is a stored cross-site scripting vulnerability in the Thai Lottery Widget WordPress plugin, affecting all versions up to and including 2.5. The issue is caused by improper neutralization of input in the `width` and `height` attributes of the `thailottery` shortcode, allowing authenticated users with Contributor or higher privileges to inject arbitrary scripts. These scripts execute in the context of users who visit the compromised pages, potentially leading to session hijacking or other script-based attacks. The CVSS 3.1 base score is 6.4, reflecting a medium severity with network attack vector, low attack complexity, and requiring privileges.

An attacker with Contributor-level access or higher can inject persistent malicious scripts into pages via shortcode attributes, which execute in the browsers of users viewing those pages. This can lead to information disclosure or user session compromise. The vulnerability does not affect availability and requires authenticated access, limiting the attack surface to users with certain privileges.

No official patch or fix is currently available for this vulnerability. Users should monitor the vendor's advisory for updates. Until a fix is released, restrict Contributor-level access to trusted users only and consider disabling or removing the Thai Lottery Widget plugin if possible to prevent exploitation.