Microsoft Actively Patching 'RoguePlanet' Zero-Day Vulnerability in Windows Defender
Microsoft issued a security advisory on Wednesday acknowledging a privilege escalation vulnerability (CVE-2026-50656, CVSS 7.8) in its Windows Defender product. The zero-day flaw was publicly disclosed last week by security researcher Nightmare Eclipse (also known as Chaotic Eclipse) before a patch was available. Microsoft says it is developing a high-quality security update and will provide details once the fix is complete.
Highlights
- Microsoft confirmed CVE-2026-50656, a privilege escalation zero-day in Windows Defender, with a CVSS score of 7.8 (high severity).
- Security researcher Nightmare Eclipse (aka Chaotic Eclipse) publicly disclosed the flaw before Microsoft issued a patch, classifying it as a zero-day.
- Microsoft stated it is developing a high-quality security update but has not provided a specific patch release timeline.
- Users are advised to monitor Microsoft's official security advisories and apply the update immediately upon release.
Microsoft issued a security advisory on Wednesday formally acknowledging a privilege escalation vulnerability in its Windows Defender product and announcing that a patch is actively in development.
Vulnerability Details
The flaw is tracked as CVE-2026-50656 and carries a CVSS score of 7.8 out of 10, placing it in the high-severity category. The vulnerability was first publicly disclosed last week by security researcher Nightmare Eclipse (also known online as Chaotic Eclipse). Because the disclosure occurred before Microsoft had issued a fix, the incident is classified as a classic zero-day vulnerability disclosure.
Microsoft's Response
In its advisory, Microsoft stated: "We are developing a high-quality security update to address this vulnerability, and information will be updated in this CVE once the fix is available."
Microsoft has not yet announced a specific timeline for the patch release. Users are advised to monitor Microsoft's official security advisories closely and apply the update as soon as it becomes available in order to mitigate potential risk.
This article was compiled based on reporting by SecurityWeek and a repost on Slashdot. Original source credited to wiredmikey.
Editor's Note: This article covers a cybersecurity topic that falls outside the drone industry. It appears to have been submitted to the translation queue in error. Please verify the source material before publication.
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