Otter Blocks < 2.6.6 - Contributor+ Stored XSS

Description The plugin is vulnerable to Stored Cross-Site Scripting via the plugin’s widgets due to insufficient input sanitization and output escaping on user supplied attributes such as ‘id’. 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.