vulnerability Microsoft Warns of Two Actively Exploited Defender Vulnerabilities Microsoft has disclosed two actively exploited vulnerabilities within its Defender security platform, CVE-2026-41091 and CVE-2026-45498, both of which allow for privilege escalation and denial-of-service attacks. These vulnerabilities have been observed in the wild by threat actors including RedSun, UnDefend, and BlueH… The Hacker News · May 21, 2026 High CVE-2026-41091CVE-2026-45498CVE-2026-33825defendervulnerabilityprivilege escalation
vulnerability Microsoft Patches Exploited UnDefend and RedSun Defender Zero-Days Microsoft released patches for two previously exploited zero-day vulnerabilities within its Defender security software. These vulnerabilities, CVE-2026-41091 and CVE-2026-45498, allowed for privilege escalation and denia… SecurityWeek · May 21, 2026 High CVE-2026-41091CVE-2026-45498CVE-2008-4250zero-dayprivilege escalationdenial of service
vulnerability CISA Adds Seven Known Exploited Vulnerabilities to Catalog CISA has added seven new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2008-4250 Microsoft Windows Buffer Overflow Vulnerability CVE-2009-1537 Micros… CISA Advisories · May 20, 2026 Medium CVE-2008-4250CVE-2009-1537CVE-2009-3459
