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Wire · opportunities

Chaotic Eclipse Claims Avast Antivirus 0-Day Vulnerability

3 September 2026 · By · Wire by Fusion42

Published

3 September 2026

Topic

opportunities

◆ Sectors

Cybersecurity

◆ Source

Read at cybersecuritynews.com →

◆ Verified

Fusion42 · 4 September 2026 · Fusion42 review

Researcher Chaotic Eclipse has publicly disclosed a zero-day local privilege-escalation vulnerability in Avast Antivirus's sandbox component that allows SYSTEM-level access on fully patched Windows 11 systems, accompanied by a proof-of-concept without vendor verification.

This Wire brief sits within Fusion42's coverage of Cybersecurity.

◆ ◆ The Wire takeaway

Windows security teams must urgently test and contain this local privilege-escalation exploit targeting Avast Antivirus sandbox to prevent SYSTEM-level breaches as attackers can now bypass common user restrictions. Your opportunity is to lead with immediate detection rules targeting suspicious sandbox behaviour before official patches arrive.

◆ Coverage

1 source · 3 Sep 2026

◆ Related on Wire

◆ Topics

Cybersecurityzero-dayavastsandbox-exploitprivilege-escalationsecurity