EUVD-2026-71779Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Sandbox escape crosses trust boundary (S:C); network-accessible with no auth in user-template-authoring deployments; confidentiality-only impact consistent with vendor CVSS 4.0 VC:H/VI:N/VA:N.
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Sandbox method allow-list bypass in Twig versions 1.0.0 through 3.26.x allows untrusted template authors to invoke any public method on Twig\Markup subclass objects, completely circumventing the application-configured SecurityPolicy allowedMethods list. The root cause is that SecurityPolicy::checkMethodAllowed() unconditionally skips policy enforcement for any object that is an instance of Twig\Markup - and because the class is not declared final, subclasses inherit the bypass. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concurrent application-level conditions: first, Twig must be configured in sandbox mode using SecurityPolicy (the sandbox is opt-in and not active by default); second, the application must pass into the sandboxed template context an object that is a proper subclass of Twig\Markup - not just the base class itself, whose own public API is minimal. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 with vector AV:N/AC:L/AT:N/PR:N/UI:N and VC:H accurately characterizes scenarios where an external, unauthenticated user can submit Twig templates - such as public email-builder APIs, CMS theme editors, or user-generated content platforms. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade twigphp/Twig to version 3.27.0 or later via Composer: `composer require twig/twig:^3.27.0`. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all applications using Twig templating engine in versions 1.0.0-3.26.x, particularly those utilizing sandbox mode with Markup-derived objects. …
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