Shared on Mage Dispatch · 09 Sep 2026
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.
Breaks down the September 2026 MCLOUD-15053 patch: fixes rollback ACL, export path traversal, GraphQL customer scope, Instant Purchase address ownership, PayPal Express quote binding, admin VAT XSS, URL escaping, plus B2B UI ACL and validator changes. Covers version-specific differences (2.4.4–2.4.9; B2B 1.3.3–1.5.3) and notes you also need APSB26-146.
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