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.

An issue was discovered in the All in One SEO Pack plugin before 3.6.2 for WordPress. The SEO Description and Title fields are vulnerable to unsanitized input from a Contributor, leading to stored XSS.

A Cross-site Scripting (XSS) vulnerability exists in the All in One SEO Pack plugin before 2.0.3.1 for WordPress via the Search parameter.

The all-in-one-seo-pack plugin before 3.2.7 for WordPress (aka All in One SEO Pack) is susceptible to Stored XSS due to improper encoding of the SEO-specific description for posts provided by the plugin via unsafe placeholder replacement.

The Semper Fi All in One SEO Pack plugin before 2.2.6 for WordPress does not consider the presence of password protection during generation of the Meta Description field, which allows remote attackers to obtain sensitive information by reading HTML source code.