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.

The SEO Plugin by Squirrly SEO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘url’ parameter in all versions up to, and including, 12.3.19 due to insufficient input sanitization and output escaping. 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. CVE-2024-43286 appears to be a duplicate of this issue.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Squirrly SEO Plugin by Squirrly SEO allows Reflected XSS.This issue affects SEO Plugin by Squirrly SEO: from n/a through 12.3.16.

Missing Authorization vulnerability in Squirrly SEO Plugin by Squirrly SEO.This issue affects SEO Plugin by Squirrly SEO: from n/a through 12.1.20.

Missing Authorization vulnerability in SEO Squirrly SEO Plugin by Squirrly SEO squirrly-seo.This issue affects SEO Plugin by Squirrly SEO: from n/a through <= 12.4.07.

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in SEO Squirrly SEO Plugin by Squirrly SEO squirrly-seo allows SQL Injection.This issue affects SEO Plugin by Squirrly SEO: from n/a through <= 12.4.03.

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Squirrly SEO Plugin by Squirrly SEO.This issue affects SEO Plugin by Squirrly SEO: from n/a through 12.3.19.

In the process of testing the SEO Plugin by Squirrly SEO WordPress plugin before 12.3.21, a vulnerability was found that allows you to implement Stored XSS on behalf of the editor by embedding malicious script, which entails account takeover backdoor