Will Microsoft Defender ShieldCrash zero-day be added to CISA KEV by end of September 2026?
[Auto-closed — deadline passed with no qualifying event] Deadline of 2026-09-30 has passed (today is 2026-10-02). No evidence in the provided recent intelligence confirms that CISA added ShieldCrash or a Microsoft Defender zero-day CVE to the Known Exploited Vulnerabilities Catalog by the deadline.
Evidence: https://threatodds.com/markets/bbdd55dc-745d-4114-a8d6-7fdbf6eaa046Market Overview
AI GENERATEDSecurity researcher Nightmare Eclipse released a new Microsoft Defender zero-day exploit named 'ShieldCrash' that grants SYSTEM-level access, disclosed shortly after Microsoft's September 2026 Patch Tuesday. The vulnerability is in Defender itself.
Primary SourceResolution Criteria
YES if CISA adds ShieldCrash (or a CVE explicitly linked to this Defender zero-day and Nightmare Eclipse disclosure) to the Known Exploited Vulnerabilities Catalog by Sept 30, 2026, based on evidence of active exploitation or imminent threat.