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Twig CVE-2026-48805

MEDIUM
Protection Mechanism Failure (CWE-693)
2026-06-30 https://github.com/twigphp/Twig GHSA-p42q-9prx-q5wq
Authentication Bypass PHP
5.3
CVSS 4.0 · Vendor: https://github.com/twigphp/Twig
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Severity by source

Vendor (https://github.com/twigphp/Twig) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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
vuln.today AI
8.5 HIGH

AC:H reflects three simultaneous prerequisites (sandbox mode, deprecated wrappers, version 3.26.x); PR:L because template submission typically requires authenticated access; S:C for sandbox escape into the broader PHP process.

3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (https://github.com/twigphp/Twig).

CVSS VectorVendor: https://github.com/twigphp/Twig

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
CVSS changed
Jul 14, 2026 - 22:22 NVD
5.3 (MEDIUM)
Analysis Generated
Jun 30, 2026 - 19:23 vuln.today

DescriptionCVE.org

Description

The 3.26.0 source-policy hardening changed the signature of CoreExtension::checkArrow() to take a boolean $isSandboxed instead of an Environment, and added the same $isSandboxed argument to CoreExtension::arraySome() and CoreExtension::arrayEvery(). Compiled templates were updated to pass the per-source sandbox state computed at the call site.

The deprecated internal wrappers exposed in src/Resources/core.php for legacy third-party code (twig_check_arrow_in_sandbox(), twig_array_some(), twig_array_every()) were not updated:

  • twig_array_some() and twig_array_every() call CoreExtension::arraySome() / arrayEvery() without forwarding the sandbox state. The underlying methods default $isSandboxed to false, so the callable-must-be-a-Closure restriction is silently bypassed in sandbox mode and a string callable such as 'strcmp' is accepted.
  • twig_check_arrow_in_sandbox() passes the Environment object where CoreExtension::checkArrow() now expects a bool, which throws a TypeError on PHP 8+.

Compiled Twig templates are not affected: they call CoreExtension::* directly with the correct arguments. Applications are only impacted if they still call the deprecated twig_* helpers on top of a sandboxed Environment.

Resolution

The three wrappers now resolve the current sandbox state via twig_resolve_is_sandboxed() (the same helper compiled templates use), and forward it to the corresponding CoreExtension::* method. twig_check_arrow_in_sandbox() no longer triggers a TypeError, and twig_array_some() / twig_array_every() now enforce the same sandbox restriction as compiled templates.

Credits

We would like to thank El Kharoubi Iosif for reporting the issue and Fabien Potencier for providing the fix.

AnalysisAI

Sandbox bypass in Twig 3.26.x allows string callables to circumvent the Closure-only restriction when applications use the deprecated twig_array_some() and twig_array_every() wrapper functions over a sandboxed Environment. The 3.26.0 source-policy hardening changed CoreExtension::checkArrow() to accept a boolean sandbox state, but the legacy wrappers in src/Resources/core.php were not updated, causing them to silently pass false for $isSandboxed and accept arbitrary string callables such as 'exec' or 'system' that the sandbox was designed to block. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify application using deprecated Twig wrappers in sandbox mode
Delivery
Submit crafted template with string callable argument
Exploit
Deprecated wrapper passes false sandbox state
Execution
CoreExtension::arraySome/arrayEvery skips Closure enforcement
Persist
Arbitrary PHP string callable executes within template context
Impact
Escape sandbox restrictions
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Vulnerability AssessmentAI

Exploitation Exploitation requires all three of the following conditions to be simultaneously true: (1) the application or a dependency it uses calls the deprecated wrapper functions `twig_array_some()`, `twig_array_every()`, or `twig_check_arrow_in_sandbox()` from `src/Resources/core.php` - compiled Twig templates that call `CoreExtension::*` methods directly are explicitly not affected; (2) the Twig `Environment` is configured to run in sandbox mode, as the sandbox restriction on non-Closure callables only applies when sandboxing is active; and (3) the installed Twig version is exactly within the 3.26.x range. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment No CVSS vector or EPSS score was provided for this CVE, so quantitative risk ranking cannot be confirmed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario In a multi-tenant CMS or SaaS application where authenticated users can submit Twig templates evaluated in sandbox mode, an attacker submits a template calling `array_some` or `array_every` with a string callable such as `'system'` or `'file_get_contents'`. Because the deprecated wrapper forwards `$isSandboxed=false` to the underlying method, the Closure restriction is not enforced and the string callable is accepted and executed, allowing the attacker to run arbitrary PHP functions outside the intended sandbox boundary. …
Remediation Upgrade Twig to version 3.27.0 or later, where all three deprecated wrappers have been corrected to resolve sandbox state via `twig_resolve_is_sandboxed()` and forward it to the corresponding `CoreExtension::*` methods. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-48805 vulnerability details – vuln.today
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