Microsoft Defender Vulnerability Management’s updated exposure score model adds vulnerability risk signals and asset context to help teams understand where risk is concentrated and which remediation actions are likely to have the greatest impact. The model is available in public preview. “The updated model addresses these customer pain points by combining vulnerability risk, exploitability signals,…
Tag: Defender
AI, Endpoint, Global Security News, malware, Network Security, Risk Management
Microsoft previews automatic device isolation in Defender for Endpoint
Microsoft is previewing a new automatic device isolation capability in Defender for Endpoint’s auto attack disruption tool to help security pros contain cyber attacks in progress on their IT networks. The company announced the capability earlier this month in a column about new features in Defender. There’s no word on when automatic device isolation will…
AI, Endpoint, Global Security News, malware, Network Security, Risk Management
Microsoft previews automatic device isolation in Defender for Endpoint
Microsoft is previewing a new automatic device isolation capability in Defender for Endpoint’s auto attack disruption tool to help security pros contain cyber attacks in progress on their IT networks. The company announced the capability earlier this month in a column about new features in Defender. There’s no word on when automatic device isolation will…
Endpoint, Global Security News, Network Security
Microsoft Defender can now automatically isolate hacked endpoints
Microsoft is testing a new Defender for Endpoint capability that will automatically isolate compromised endpoints to thwart attackers’ attempts to move laterally across the network. […]
AI, Exploits, Global Security News, malware
Microsoft Defender vulnerabilities exploited in the wild (CVE-2026-41091, CVE-2026-45498)
Attackers are exploiting two Microsoft Defender vulnerabilities (CVE-2026-41091 and CVE-2026-45498), Microsoft acknowledged and CISA confirmed by adding them to its Known Exploited Vulnerabilities catalog. The vulnerabilities CVE-2026-41091 allows for local privilege elevation (LPE), and is caused by the Microsoft Malware Protection Engine improperly resolving links before accessing files. “An attacker who successfully exploited this vulnerability…
AI, Exploits, Global Security News
Microsoft Warns of Two Actively Exploited Defender Vulnerabilities
Microsoft has disclosed that a privilege escalation and a denial-of-service flaw in Defender has come under active exploitation in the wild. The former, tracked as CVE-2026-41091, is rated 7.8 on the CVSS scoring system. Successful exploitation of the flaw could allow an attacker to gain SYSTEM privileges. “Improper link resolution before file access (‘link following’)…
Exploits, Global Security News
Microsoft warns of new Defender zero-days exploited in attacks
On Wednesday, Microsoft started rolling out security patches for two Defender vulnerabilities that have been exploited in zero-day attacks. […]
Cybersecurity, Global Security News
Windows Zero-Days Expose BitLocker Bypasses And CTFMON Privilege Escalation
An anonymous cybersecurity researcher who disclosed three Microsoft Defender vulnerabilities has returned with two more zero-days involving a BitLocker bypass and a privilege escalation impacting Windows Collaborative Translation Framework (CTFMON). The security defects have been codenamed YellowKey and GreenPlasma, respectively, by the researcher, who goes by the online aliases Chaotic Eclipse
AI, Data Breaches, Endpoint, Global Security News, malware, Network Security, Risk Management
Microsoft Defender Flags DigiCert Certificates as Malware
A recent Microsoft Defender update incorrectly flagged legitimate DigiCert root certificates as malware, triggering widespread alerts. In some cases, it also removed trusted certificates from Windows systems, causing disruption. “Earlier today we determined false positive alerts were mistakenly triggered and updated the alert logic,” Microsoft said, as reported by BleepingComputer. Inside the DigiCert False Positive…
Global Security News
Microsoft Defender wrongly flags DigiCert certs as Trojan:Win32/Cerdigent.A!dha
Microsoft Defender is detecting legitimate DigiCert root certificates as Trojan:Win32/Cerdigent.A!dha, resulting in widespread false-positive alerts, and in some cases, removing certificates from Windows. […]
Exploits, Global Security News
CISA orders feds to patch BlueHammer flaw exploited as zero-day
CISA has ordered U.S. federal agencies to patch a Microsoft Defender privilege escalation flaw (dubbed BlueHammer) that has been exploited in zero-day attacks. […]
AI, Cybersecurity, Exploits, Global Security News, Network Security, Risk Management
U.S. CISA adds a flaw in Microsoft Defender to its Known Exploited Vulnerabilities catalog
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds a flaw in Microsoft Defender to its Known Exploited Vulnerabilities catalog The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a flaw in Microsoft Defender, tracked as CVE-2026-33825 (CVSS score of 7.8), to its Known Exploited Vulnerabilities (KEV) catalog. CVE-2026-33825 is a Microsoft Defender flaw that can be exploited…
AI, Exploits, Global Security News
Microsoft Defender under attack as three zero-days, two of them still unpatched, enable elevated access
Attackers exploit three Microsoft Defender zero-days, code-named BlueHammer, RedSun, and UnDefend, to gain elevated access. Attackers are exploiting three recently disclosed zero-day flaws in Microsoft Defender to gain higher privileges on compromised systems. The vulnerabilities, called BlueHammer, RedSun, and UnDefend, were revealed by a researcher known as Chaotic Eclipse after criticizing Microsoft’s handling of the…
AI, Exploits, Global Security News
Another Microsoft Defender privilege escalation bug emerges days after patch
Days after Microsoft patched a high-severity issue affecting its Windows Defender antivirus tool through April’s Patch Tuesday, researchers warn of another vulnerability that could enable SYSTEM privileges through local escalation. In a newly disclosed proof-of-concept (PoC) exploit, dubbed “RedSun,” GitHub user going by the name “Nightmare Eclipse” demonstrated how Microsoft Defender’s handling of certain cloud-tagged…
Cybersecurity, Exploits, Global Security News
New Microsoft Defender “RedSun” zero-day PoC grants SYSTEM privileges
A researcher known as “Chaotic Eclipse” has published a proof-of-concept exploit for a second Microsoft Defender zero-day, dubbed “RedSun,” in the past two weeks, protesting how the company works with cybersecurity researchers. […]
Global Security News
New Microsoft and Rubrik Integration Delivers Complete Identity Attack Response
Microsoft Defender and Rubrik Identity Resilience create a unified detection-to-recovery offering; customers achieve trusted recovery in hours instead of days
AI, Apps, Endpoint, Global Security News, malware, Network Security
Lumu enhances Defender to detect compromise across network, cloud, endpoint, and identity
Lumu has upgraded its Lumu Defender NDR solution, extending Continuous Compromise Assessment beyond the network to include endpoints, cloud environments, and user behavior for unified visibility. The past year marks a strategic shift in attack methods, with threat actors pivoting from high-profile malware to increasingly sophisticated, stealth-based tactics. The increase of AI-driven security attacks, attackers…
Global Security News
Storm-2561 Uses Fake Fortinet, Ivanti VPN Sites to Drop Hyrax Infostealer
In mid-January 2026, Microsoft Defender Experts identified a devious way that cybercriminals are tricking people into giving away…
Endpoint, Global Security News
New Defender deployment tool streamlines Windows device onboarding with single executable
Microsoft’s Defender deployment tool for Windows helps administrators manage device onboarding at scale with updated progress visibility and additional controls. Simplified deployment with added administrative controls The tool adapts to the operating system and supports endpoint security across a broad range of Windows devices. It eliminates the need for separate onboarding files for modern and…
AI, Global Security News
Fake Next.js job interview tests backdoor developer’s devices
The Microsoft Defender team has discovered a coordinated campaign targeting software developers through malicious repositories posing as legitimate Next.js projects and technical assessment materials, including recruiting coding tests. […]
AI, Global Security News
Microsoft Defender update lets SOC teams manage, vet response tools
Microsoft introduced library management in Microsoft Defender to help security analysts working with live response manage scripts and tools they use to triage, investigate and remediate threats. The library management interface allows analysts to organize their investigation tools and manage everything without waiting for an active session. “This enhancement in Defender’s live response tooling improves…