Input validation vulnerability in Volunteer Sign Up Sheets 5.5.4

The Volunteer Sign Up Sheets plugin for WordPress has a security issue that could allow malicious code to be injected into pages. This can happen if an attacker with high-level access to the website’s settings adds harmful scripts. This vulnerability affects versions up to 5.5.4 and can only occur in installations with multiple sites or with a specific security setting disabled. To fix this, the plugin’s author has released a patched version on their Github page.