SECURITYQUIET
24 days ago
New Windows Defender zero-day blocks Microsoft antivirus updates
SIGNALSMONITORSECURITY
What's happening
SignalsMonitor is following this as a security story. BleepingComputer is the outlet attached so far. The first report grouped here was at 22 Sept 2026, 09:55 UTC. The headline in use is “New Windows Defender zero-day blocks Microsoft antivirus updates”. This note is SignalsMonitor's own briefing, not the publisher's article.
What we know
Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates. [...
BleepingComputerRead at BleepingComputer
Story timeline
Reports grouped into this story, earliest first. Exact repeats from the same outlet are collapsed.
- First reported by BleepingComputer
New Windows Defender zero-day blocks Microsoft antivirus updates
Reported by 1 outlet
- BleepingComputer
- BleepingComputerNew Windows Defender zero-day blocks Microsoft antivirus updates