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BlueHammer, RedSun, and UnDefend: Three Windows Defender Zero-Days Exploited in the Wild

17.04.2026

BlueHammer, RedSun, and UnDefend: Three Windows Defender Zero-Days Exploited in the Wild Three Windows Defender vulnerabilities disclosed as zero-days in April 2026 are now being actively exploited: BlueHammer, RedSun, and UnDefend. All three vulnerabilities were published without patches as Proof-of-Concept (PoC) exploits by an anonymous security researcher protesting their treatment by Microsoft’s Security Response Center. […]

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security

CISA Adds Three Known Exploited Vulnerabilities to Catalog

06.04.2026

CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2021-22054 Omnissa Workspace ONE Server-Side Request Forgery CVE-2025-26399 SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability CVE-2026-1603 Ivanti Endpoint Manager (EPM) Authentication Bypass Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber […]

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