Shared on Mage Dispatch · 10 Sep 2026
Covers how the Style Smuggler vulnerability (CVE-2026-75650) works, how to detect potential compromise, and practical remediation and hardening steps. Note: Content could not be fetched; details inferred from the URL.
Root-cause patch that restricts directive signing to explicitly deferred directives (like inlinecss), preventing signatures on unresolved directives exploited in the StyleSmuggler chain. Includes ready-to-apply patches for versions 2.4.5–2.4.9 and instructions for using composer-patches/cweagans.
Ports the StyleSmuggler (CVE-2026-75650, CVSS 10.0) hotfix with added hardening, includes September isolated patch APSB26-138, and fixes four bugs. Provides remediation guidance for possible compromises and notes ACL and template/block policy changes that may affect previews and custom directives.
Official bulletin for APSB26-138 detailing impacted versions, severity ratings, CVEs, and fixed releases. Only partial content was accessible during fetch; open the link for full details.
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