CVE-2026-46636 — Twig: Sandbox method allowlist bypass via `Markup` subclass
Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances o…
Published: 2026-09-04 · CVSS: 8.7 · CVSS 4.0
Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7