PHP

SSTI in PHP template engines: Twig (Symfony) filter-callback RCE and Smarty's PHP execution constructs.

1 мин читањеажурирано 7 окт. 2026 г.florianamette1 соработник
Прашајте го асистентот (MCP)Уреди на GitHub

PHP's two common template engines both lead to code execution from a template injection, though by different routes. Twig (the default in Symfony and widely used standalone) is reached through its filter and function callbacks; Smarty exposes PHP more directly through dedicated constructs that have tightened over versions.

Detect Twig with {{7*7}} returning 49, and Smarty with {$smarty.version} echoing the version string (Smarty uses single braces, so {7*7} is not a reliable probe and may error).

Engines#

  • Twig: filter/map callbacks to system, and the historical _self registerUndefinedFilterCallback.
  • Smarty: the {php} tag and static-method constructs, with their version gating.

References#

  • Twig and Smarty documentation (sandbox, security policy)
  • PortSwigger Web Security Academy: Server-side template injection
ПретходнаPugСледна Smarty