CVE-2023-34253 Grav vulnerable to Server-side Template Injection (SSTI) via Denylist Bypass

Grav is a flat-file content management system. Prior to version 1.7.42, the denylist introduced in commit 9d6a2d to prevent dangerous functions from being executed via injection of malicious templates was insufficient and could be easily subverted in multiple ways -- 1 using unsafe functions that...