Deep dive into CVE-2026-96951, the actively exploited Windows Shell command injection from the record 1,413-CVE October 2026 Patch Tuesday: the full Mark-of-the-Web anatomy (Zone.Identifier ADS, IAttachmentExecute zone semantics, SmartScreen/Protected View/App Guard consumers), the four-year bypass lineage from Magniber's containers to 7-Zip's RAR5 stream trick to APT28's zero-click Shell bugs, why the exploit economics always pointed here, the notable fact that one of the finders is a Google TAG researcher credited as using Claude with Anthropic, and the controls that still work when the marker is gone.
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