The SEO Plugin by Squirrly SEO plugin for WordPress is vulnerable to Arbitrary Post Creation and Stored Cross-Site Scripting in all versions up to, and including, 14.0.0 due to a leak of an API token and insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to create arbitrary posts, and, if the Advanced Custom Fields plugin is installed and activated, inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The SEO Plugin by Squirrly SEO plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 12.4.16. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with contributor-level access and above, to invoke privileged state-changing Squirrly cloud API operations, such as revoking the site's Google Search Console and Google Analytics integrations via api/gsc/revoke and api/ga/revoke, that are otherwise restricted to administrator-level users holding the sqmanagesettings capability.