Twig: Sandbox property allowlist bypass via the `column` filter under `SourcePolicyInterface`
The advisory, in context
Description
This is a residual bypass of CVE-2026-46635 / GHSA-vcc8-phrv-43wj that only affects sandboxing enabled through SourcePolicyInterface (and not the regular global sandbox mode).
CoreExtension::column() receives the active sandbox state via the needs_is_sandboxed channel as a boolean $isSandboxed, but then routes the per-element property reads through SandboxExtension::checkPropertyAllowed() without forwarding the current Source. SandboxExtension::checkPropertyAllowed() re-evaluates isSandboxed($source) internally; with $source = null the SourcePolicyInterface-driven decision is lost, the method short-circuits to "not sandboxed", and the property allowlist is never consulted.
A template author whose sandbox is gated by a SourcePolicyInterface and who has column on their allowedFilters list can therefore read any public or magic property of any object reachable in the render context, regardless of SecurityPolicy::$allowedProperties. Direct attribute access to the same property is blocked, and the same payload is also blocked under global sandbox mode, which makes this a clear policy enforcement gap rather than a configuration issue.
Resolution
CoreExtension::column() no longer goes through the SandboxExtension wrapper for the property check. It calls the security policy directly: the per-source decision is already captured by the $isSandboxed boolean computed at the call site, so the property allowlist is enforced consistently for both global and source-policy sandboxing.
Credits
Twig would like to thank Vincent55 Yang for reporting the issue and Fabien Potencier for providing the fix.
Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
Earlier releases before 3.27.0
Fixed in 3.27.0
243 explicitly affected versions
1.3.0, 1.4.0, 1.5.0, 1.5.1, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.6.5, v1.10.0, v1.10.1, v1.10.2, v1.10.3, v1.11.0, v1.11.1, v1.12.0, v1.12.0-RC1, v1.12.1, v1.12.2, v1.12.3, v1.13.0, v1.13.1, v1.13.2, v1.14.0, v1.14.1, v1.14.2, v1.15.0, v1.15.1, v1.16.0, v1.16.1, v1.16.2, v1.16.3, v1.17.0, v1.18.0, v1.18.1, v1.18.2, v1.19.0, v1.20.0, v1.21.0, v1.21.1, v1.21.2, v1.22.0, v1.22.1, v1.22.2, v1.22.3, v1.23.0, v1.23.1, v1.23.2, v1.23.3, v1.24.0, v1.24.1, v1.24.2, v1.25.0, v1.26.0, v1.26.1, v1.27.0, v1.28.0, v1.28.1, v1.28.2, v1.29.0, v1.30.0, v1.31.0, v1.32.0, v1.33.0, v1.33.1, v1.33.2, v1.34.0, v1.34.1, v1.34.2, v1.34.3, v1.34.4, v1.35.0, v1.35.1, v1.35.2, v1.35.3, v1.35.4, v1.36.0, v1.37.0, v1.37.1, v1.38.0, v1.38.1, v1.38.2, v1.38.3, v1.38.4, v1.39.0, v1.39.1, v1.40.0, v1.40.1, v1.41.0, v1.42.0, v1.42.1, v1.42.2, v1.42.3, v1.42.4, v1.42.5, v1.43.0, v1.43.1, v1.44.0, v1.44.1, v1.44.2, v1.44.3, v1.44.4, v1.44.5, v1.44.6, v1.44.7, v1.44.8, v1.7.0, v1.8.0, v1.8.1, v1.8.2, v1.8.3, v1.9.0, v1.9.1, v1.9.2, v2.0.0, v2.1.0, v2.10.0, v2.11.0, v2.11.1, v2.11.2, v2.11.3, v2.12.0, v2.12.1, v2.12.2, v2.12.3, v2.12.4, v2.12.5, v2.13.0, v2.13.1, v2.14.0, v2.14.1, v2.14.10, v2.14.11, v2.14.12, v2.14.13, v2.14.2, v2.14.3, v2.14.4, v2.14.5, v2.14.6, v2.14.7, v2.14.8, v2.14.9, v2.15.0, v2.15.1, v2.15.2, v2.15.3, v2.15.4, v2.15.5, v2.15.6, v2.16.0, v2.16.1, v2.2.0, v2.3.0, v2.3.1, v2.3.2, v2.4.0, v2.4.1, v2.4.2, v2.4.3, v2.4.4, v2.4.5, v2.4.6, v2.4.7, v2.4.8, v2.5.0, v2.6.0, v2.6.1, v2.6.2, v2.7.0, v2.7.1, v2.7.2, v2.7.3, v2.7.4, v2.8.0, v2.8.1, v2.9.0, v3.0.0, v3.0.0-BETA1, v3.0.1, v3.0.2, v3.0.3, v3.0.4, v3.0.5, v3.1.0, v3.1.1, v3.10.0, v3.10.1, v3.10.2, v3.10.3, v3.11.0, v3.11.1, v3.11.2, v3.11.3, v3.12.0, v3.13.0, v3.14.0, v3.14.1, v3.14.2, v3.15.0, v3.16.0, v3.17.0, v3.17.1, v3.18.0, v3.19.0, v3.2.1, v3.20.0, v3.21.0, v3.21.1, v3.22.0, v3.22.1, v3.22.2, v3.23.0, v3.24.0, v3.25.0, v3.26.0, v3.3.0, v3.3.1, v3.3.10, v3.3.2, v3.3.3, v3.3.4, v3.3.5, v3.3.6, v3.3.7, v3.3.8, v3.3.9, v3.4.0, v3.4.1, v3.4.2, v3.4.3, v3.5.0, v3.5.1, v3.6.0, v3.6.1, v3.7.0, v3.7.1, v3.8.0, v3.9.0, v3.9.1, v3.9.2, v3.9.3
View affected-version evidence
{
"ranges": [
{
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{
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"type": "ECOSYSTEM"
}
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}References
- https://github.com/twigphp/Twig/security/advisories/GHSA-h8vq-8gpg-mhcg
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-48808.yaml
- https://github.com/twigphp/Twig
- https://github.com/twigphp/Twig/releases/tag/v3.27.0
- https://symfony.com/blog/cve-2026-48808-sandbox-property-allowlist-bypass-via-the-column-filter-under-sourcepolicyinterface