You're looking for information on the "Pico 3.0.0-alpha.2 Exploit".

statements, has "finicky" behavior when handling multiline strings. The Exploit

Restrict File Permissions: Ensure the content, config, and plugins directories are not globally writable. The web server should only have write access to specific cache folders.

Token Manipulation: Users can place code within a multiline string, which only costs 1 token. After the preprocessor "patches" or processes the code, it is no longer treated as a string, and the system executes it as regular code.