Grav: Twig sandbox config exfiltration via grav.offsetGet + dump filter (CVE-2026-44738 bypass)

Summary

The Twig content sandbox replaces config with the redacted SandboxConfig facade and strips Config::get/toArray from the method allowlist (GHSA-j274-39qw-32c9), so editor content can't read config secrets via config. That's bypassable: grav is the raw container, offsetget is allow-listed on it, so grav.offsetGet('config') returns the real Config. The allow-listed filters json_encode/print_r/yaml_encode then serialize it at the PHP level, never hitting the sandbox method gate, dumping the whole config tree including every plugins.* secret (SMTP creds, API keys, plugin DB creds). Incomplete fix for GHSA-j274-39qw-32c9. security.salt does not leak (it lives outside config).

Details

The documented path is blocked: config is the SandboxConfig facade (Twig.php:660) and the raw Config/Data method entries are stripped when config_access is false, so {{ config.get(...) }} returns the default and {{ grav.offsetGet('config').get(...) }} raises SecurityNotAllowedMethodError.

The bypass uses two allow-listed primitives the redaction doesn't cover:

1. grav.offsetGet('config') returns the raw Config. The SandboxConfig facade replaces only the config variable, not grav['config']; offsetget is allow-listed on Grav\Common\Grav in system/config/security.yaml.
2. json_encode/print_r/yaml_encode serialize the object inside the filter and never call GravSecurityPolicy::checkMethodAllowed (GravSecurityPolicy.php:65), so the stripped methods don't matter.

Bug class: object-dumping filters bypass the sandbox member gate. The same dump reaches page/pages/uri/user via their allow-listed accessors; config is the secret-bearing target.

Reachable below the publisher-Twig opt-in: a _-prefixed slug is modular (Page.php:228), and Page::content() sets $process_twig = $scan_twig_xss || $this->modularTwig() (), so a modular child's body Twig is sandboxed-rendered even with false (the default), while stays false so the render-time XSS scan (GHSA-2c4f-86xc-cr74) is skipped. Any author (or filesystem write to ) exfiltrates config on a stock install. On a regular page the whole-tree dump trips the XSS scan and is blanked, but a targeted / extraction of one subtree is XSS-clean and survives.