The Loco Translate WordPress plugin before 2.8.9 does not restrict which file paths its translation file routes will read, allowing users granted the Loco Translate WordPress plugin before 2.8.9's translator capability to retrieve the contents of files of certain types from anywhere on the server, including outside the web root.

The Loco Translate WordPress plugin before 2.8.9 does not sanitise and escape some bundle configuration values before outputting them back in an admin page, allowing users with the translator capability and above to perform Stored Cross-Site Scripting attacks against high privilege users such as administrators.

The Loco Translate plugin for WordPress is vulnerable to Stored Cross-Site Scripting via PO File Extracted Comments in all versions up to, and including, 2.8.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with translator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Loco Translate plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.8.5. This is due to missing or incorrect nonce validation on the execTemplate function. This makes it possible for unauthenticated attackers to execute arbitrary PHP code on the server by supplying a php://filter stream wrapper URI as the 'template' parameter, which bypasses path validation and is passed directly to the include sink in execTemplate() via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.