Security researcher Abdelhamid Naceri, also known as Nightmare Eclipse, has published another Windows Defender zero-day exploit. The flaw prevents Microsoft's antivirus from receiving updates, which could leave systems vulnerable to new threats while the update mechanism is disrupted.
The exploit was released over the weekend, according to the report. No details about a patch or official mitigation were mentioned in the source, and it is unclear whether Microsoft has acknowledged the issue yet.
This is not the first time Naceri has disclosed a Defender flaw; the researcher has previously released similar exploits. The repeated disclosures highlight ongoing concerns about the security of Microsoft's built-in antivirus product.