🛡️ **DEVELOPING — ShieldBreak Windows Zero-Day PoC Disclosed; SYSTEM-Level Escalation**
Published Thursday, August 13, 2026 at 04:39 AM PT BLUF: Threat actor group Nightmare Eclipse has disclosed a Windows zero-day vulnerability (“ShieldBreak”) with publicly available proof-of-concept code enabling privilege escalation to SYSTEM level. Vulnerability bypasses Microsoft Defender patches. Affected OS versions and official CVE details remain unconfirmed; treat as DEVELOPING. DETAILS Threat Actor: Nightmare Eclipse disclosed ShieldBreak, a Windows privilege escalation zero-day Capability: Enables attackers to escalate privileges to SYSTEM-level access on compromised systems Status: Proof-of-concept (PoC) code reportedly released; active disclosure underway Defense Bypass: Exploits bypass Microsoft Defender patches (specifically “RoguePlanet” patch) Critical Unknowns: Specific CVE ID, affected Windows versions, attack prerequisites, and CVSS score not yet confirmed in available sources IMPACT ...