Muse, Meta's extraordinarily privileged AI assistant, has a serious 0-day

What happened

A simple ClickFix attack is only one way to completely hijack the new agent.

Why it matters

The launch may affect adoption and competitive positioning for Meta; usage evidence is the next signal to watch.

Affected entities

View evidence

2 reports · 1 original report · 2 independent

1. Ars Technica AIPrimary source · Supports · EN · 100%
   Muse, Meta's extraordinarily privileged AI assistant, has a serious 0-day ↗Sep 21, 2026, 6:24 PM
2. The Hacker NewsIndependent · Supports · EN · 55%
   One Hidden Meta Muse Setting Could Let Attackers Turn the AI Assistant Into a Backdoor ↗Sep 22, 2026, 2:33 AM

Claims

• Muse, Meta's extraordinarily privileged AI assistant, has a serious 0-day Observed

Conflicts

No material conflict detected in the available evidence.

Timeline

1. September 21, 2026 at 6:24 PMFirst reported
2. Sep 22, 2026, 2:43 AMUnverified · 64/66%

Market move following event

Market reaction is not yet available for this asset and time window.

Score explanation