Limitations are just an illusion - advanced server-side template exploitation with RCE everywhere

This research write-up demonstrates advanced SSTI exploitation techniques and provides concrete, self-contained payloads that achieve remote code execution across numerous template engines (Jinja2, Mako, Twig, Smarty, Blade, Groovy, FreeMarker, Razor). The report explains engine-specific challenges and bypasses (notably performing exploitation without quotes or external resources) and concludes with mitigation guidance such as input sanitisation, secure template configuration, and timely patching.