The Otter Blocks plugin for WordPress, which is used for creating and editing website pages, has a security vulnerability that allows for malicious code to be injected into pages through the use of SVG files. This vulnerability exists in all versions up to 3.0.4 and can be exploited by authenticated attackers with Author-level access or higher. This means that the code can be executed whenever a user accesses the SVG file, posing a risk for website security.