Shared on Mage Dispatch · 08 Sep 2026
Details how APSB26-146 closes three issues—unsafe object instantiation reachable from CMS/email templates, untyped preview inputs, and writable error reports—and outlines patching steps plus checks to catch similar instantiate-then-check anti-patterns.
Pre-split APSB26-146 (VULN-39341) patches tailored for cweagans/composer-patches, organized per 2.4.4-p18 through 2.4.9 with a drop-in patches.json. Covers framework, base, backend, email, and newsletter packages, with steps to apply via Composer.
Patch implementing explicit directive deferral and signing in the template filter to block unresolvable directives from being treated as deferred and executed by parent templates. Includes diffs for Framework Template and Email Template Filter, adapted for Composer installs and intended to be applied alongside APSB26-146.
Adds interim, application-layer guards against the StyleSmuggler zero-day: validates URL-generator classes, blocks stream-wrapper template paths, sanitizes email template styles, and hardens reports/logs. Includes a block-directive allowlist and optional suppression of failed-payment emails; meant as defense-in-depth until an official fix.
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