WP Fastest Cache – WordPress Cache Plugin

The WP Fastest Cache – WordPress Cache Plugin plugin for WordPress is vulnerable to Cache Poisoning in versions 0.8.7.7 through 1.5.0. This is due to missing exclusion of requests with query strings from the page cache, allowing cache entries for clean URLs to be overwritten by requests carrying arbitrary query parameters. This makes it possible for unauthenticated attackers to poison the page cache by requesting a URL with tracking query parameters, causing their rendered page context to be stored and served to every subsequent visitor of the clean URL.

The WP Fastest Cache – WordPress Cache Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via HTTP Host Header in all versions up to, and including, 1.5.0 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. This requires the Polylang or Polylang Pro plugin to be active and the Combine JS option to be enabled, as these conditions trigger the vulnerable Host-header-to-URL code path that writes attacker-controlled script src values into the shared page-cache file served to all subsequent visitors.

The Fastest Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 1.5.0. This is 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 Fastest Cache plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the wpfc_db_fix_callback() function in all versions up to, and including, 1.4.0. This makes it possible for authenticated attackers, with Subscriber-level access and above, to initiate several database fix actions. This only affects sites with premium activated.