Shared on Mage Dispatch · 07 Sep 2026
Stopgap hardening package for the Sansec‑disclosed StyleSmuggler RCE: Nginx/Apache request filters, a DI‑scanner CLI guard, a sanitizing module, and scripts for compromise checks, containment, and DB audits. Includes deployment, testing, and incident‑response runbooks; designed to be removed once an official fix ships.
Configure navigation, buttons, forms, messages, and more in Admin, with values exposed as --kumar-* CSS variables for easy theme use. Supports per-scope settings (default, website, store view) and includes color pickers.
Diff introduces SecurePathValidator to reject stream/writable paths during template rendering, blocks backend/adminhtml blocks in {{block}} directives, and neutralizes PHP tags in error reports. Also tightens DI/setup scanners and grid URL generator type checks to avoid unsafe class/path resolution.
Composer-installable module that mitigates the Style Smuggler vulnerability by allowlisting email template {{block}} classes, validating grid row URL generator classes, and neutralizing Web API fatal error report output. Includes setup steps and di.xml examples to allowlist needed email blocks and guidance on checking logs for refused classes.
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