The WP Games Embed plugin for WordPress allows authenticated users with Contributor access or higher to embed malicious code via the [game] shortcode. Because the plugin fails to sanitize or escape user‑supplied attributes such as width, height, src, title, description, game_url, main, and thumb, the input is directly concatenated into the HTML output. This results in stored cross‑site scripting that executes whenever a visitor loads a page containing the malicious shortcode. An attacker could hijack sessions, deface content, or spread malware to all users who view affected posts or pages. The vulnerability corresponds to CWE‑79 (Improper Neutralization of Input During Web Page Generation).

WordPress plugin WP Games Embed (developed by sammyb) in all releases from 0.0 up to and including 0.1beta. The vulnerability is present in every version up to 0.1beta; no newer release with a fixed version is mentioned in the data. Therefore any WordPress site that continues to use WP Games Embed version 0.1beta or earlier is susceptible.

The CVSS base score is 6.4, indicating moderate severity. No EPSS score is available, and the flaw is not listed in the CISA KEV catalog. Exploitation requires an attacker to possess Contributor‑level permissions on the target WordPress installation to insert the malicious shortcode via the editor. Once embedded, the script runs in the browsers of all visitors who view the affected content, providing a widespread impact. The limited privilege requirement means that social engineering or credential compromise of a contributor account is sufficient to exploit the flaw. The vulnerability is unlikely to be used in the wild without such access, but the moderate CVSS and lack of mitigation such as a CSP suggest a tangible risk to sites with permissive contributor roles.