The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in JoomUnited WP Meta SEO allows Stored XSS.This issue affects WP Meta SEO: from n/a through 4.5.13.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in JoomUnited WP Meta SEO allows Stored XSS.This issue affects WP Meta SEO: from n/a through 4.5.13.

The WP Meta SEO plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 4.5.12 via the meta description. This makes it possible for unauthenticated attackers to disclose potentially sensitive information via the meta description of password-protected posts.

The WP Meta SEO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘Referer’ header in all versions up to, and including, 4.5.12 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The WP Meta SEO WordPress plugin before 4.5.5 does not validate image file paths before attempting to manipulate the image files, leading to a PHAR deserialization vulnerability. Furthermore, the plugin contains a gadget chain which may be used in certain configurations to achieve remote code execution.

The WP Meta SEO WordPress plugin before 4.5.3 does not authorize several ajax actions, allowing low-privilege users to make updates to certain data and leading to an arbitrary redirect vulnerability.

The WP Meta SEO WordPress plugin before 4.5.3 does not properly sanitize and escape inputs into SQL queries, leading to a blind SQL Injection vulnerability that can be exploited by subscriber+ users.

The WP Meta SEO plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 4.5.3. This is due to missing or incorrect nonce validation on the setIgnore function. This makes it possible for unauthenticated attackers to update plugin options via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The WP Meta SEO plugin for WordPress is vulnerable to unauthorized sitemap generation due to a missing capability check on the checkAllCategoryInSitemap function in versions up to, and including, 4.5.3. This makes it possible for authenticated attackers with subscriber-level access to obtain post categories. This vulnerability occurred as a result of the plugin relying on nonce checks as a means of access control, and that nonce being accessible to all authenticated users regardless of role.