All in One SEO – Best WordPress SEO Plugin – Easily Improve SEO Rankings & Increase Traffic < 4.6.1.1 - Contributor+ Stored Cross-Site Scripting via Shortcode

Description The All in One SEO – Best WordPress SEO Plugin – Easily Improve SEO Rankings & Increase Traffic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin’s shortcode(s) insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

PoC

As a contributor, add the following shortcode to a post: [aioseo_html_sitemap label_tag=“img src onerror=alert(/XSS-sitemap/)”] The XSS will be triggered when anyone access the post dashboard (/wp-admin/edit.php?post_type=post)