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VulnerabilitiesApr 16, 2026

ThreatsDay Bulletin: Defender 0-Day, SonicWall Brute-Force, 17-Year-Old Excel RCE and 15 More Stories

Weekly security bulletin covers Defender zero-day, SonicWall brute-force attacks, and 17-year-old Excel RCE

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Summary

ThreatsDay Bulletin highlights a critical week in security news featuring a Microsoft Defender zero-day vulnerability, SonicWall brute-force attack campaigns, and a long-standing Excel remote code execution flaw dating back 17 years. The roundup captures an active threat landscape with both novel exploits and dormant vulnerabilities being actively weaponized, alongside supply chain security concerns.

Entities

Microsoft (vendor)Microsoft Defender (product)SonicWall (vendor)Microsoft Excel (product)