# CVE-2026-46636

## Summary

- **CVE ID:** CVE-2026-46636
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-1336
- **Published:** Sep 4, 2026
- **Last Modified:** Sep 8, 2026

## Description

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.

## Affected Products

- twigphp — Twig (>= 1.0.0, < 3.27.0)

## References

- [CNA](https://github.com/twigphp/Twig/security/advisories/GHSA-64jr-qjx4-w2fh)
- [CNA](https://security-tracker.debian.org/tracker/CVE-2026-46636)
- [CNA](https://security-tracker.debian.org/tracker/DSA-6311-1)
- [CNA](https://symfony.com/blog/cve-2026-46636-sandbox-filter-tag-and-function-allow-list-bypass-when-sandbox-state-changes-between-renders)
- [CNA](http://github.com/twigphp/Twig/releases/tag/v3.27.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 29.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._