Scramble vulnerable to remote code execution via evaluation of user-controlled input in validation rules

Impact

A remote code execution (RCE) vulnerability affects versions 0.13.2 through 0.13.21. When documentation endpoints are publicly accessible and validation rules reference user-controlled input, request supplied data may be evaluated during documentation generation, leading to execution of arbitrary PHP code in the application context.

Patches

Fixed in version 0.13.22.

Workarounds

If upgrading is not immediately possible:

• Restrict access to documentation endpoints (/docs/api, /docs/api.json)
• Avoid using user-controlled variables inside validation rule expressions (e.g., values derived from request input)
• Disable documentation endpoints in production environments if not required

These measures significantly reduce or prevent exploitability.