PT-2026-42162

Name of the Vulnerable Software and Affected Versions Microsoft Defender affected versions not specified Description A heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network. A heap-based buffer overflow occurs when an application writes mo...

Microsoft Defender 后置链接漏洞

Microsoft Defender is a threat protection software developed by the American company Microsoft. Microsoft Defender has a postback link vulnerability, which stems from improper link resolution before file access. This vulnerability could allow authorized attackers to gain local privileges...

Microsoft Defender Link Following Vulnerability

Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally...

Microsoft Defender Denial of Service Vulnerability

Microsoft Defender contains an unspecified vulnerability that allows for denial of service...

CVE-2026-41091

creationtimestamp| type| source ---|---|--- 2026-05-19 21:00:00+00:00| seen| https://www.govcert.gov.hk/en/alertsdetail.php?id=1878 2026-05-20 10:16:09+00:00| seen| https://cyber.gc.ca/en/alerts-advisories/microsoft-security-advisory-av26-489 2026-05-20 14:10:08+00:00| seen|...

Microsoft Defender Denial of Service Vulnerability

...

Microsoft Defender Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network...

Microsoft Defender Elevation of Privilege Vulnerability

Improper link resolution before file access 'link following' in Microsoft Defender allows an authorized attacker to elevate privileges locally...

Microsoft Defender 安全漏洞

Microsoft Defender is a threat protection software developed by the American company Microsoft. There is a security vulnerability in Microsoft Defender, which stems from a heap buffer overflow. Unauthorized attackers may execute code through the network as a result of this vulnerability...

PT-2026-42157

Name of the Vulnerable Software and Affected Versions Microsoft Defender affected versions not specified Description An issue exists in the Microsoft Malware Protection Engine within Microsoft Defender involving improper link resolution before file access, also known as link following. This flaw...

Microsoft Defender 安全漏洞

Microsoft Defender is a threat protection software developed by the American company Microsoft. There is a security vulnerability in Microsoft Defender, and this vulnerability stems from a denial-of-service attack...

PT-2026-42161

Name of the Vulnerable Software and Affected Versions Microsoft Defender Antimalware Platform affected versions not specified Description An issue exists involving uncontrolled resource consumption. Exploitation of this flaw could allow an attacker to cause a denial of service, which is a conditi...

Kazuar: Anatomy of a nation-state botnet

In this article 1. Delivery 2. Module types 3. Botnet operations 4. Who is Secret Blizzard? 5. Mitigation and protection guidance 6. Microsoft Defender detections Kazuar, a sophisticated malware family attributed to the Russian state actor Secret Blizzard, has been under constant development for...

Email threat landscape: Q1 2026 trends and insights

In this article 1. Tycoon2FA disruption impact 2. QR code phishing attacks 3. CAPTCHA tactics 4. Malicious payloads 5. Business email compromise 6. Defending against email threats 7. Microsoft Defender detections During the first quarter of 2026 January-March, Microsoft Threat Intelligence detect...

Email threat landscape: Q1 2026 trends and insights

In this article 1. Tycoon2FA disruption impact 2. QR code phishing attacks 3. CAPTCHA tactics 4. Malicious payloads 5. Business email compromise 6. Defending against email threats 7. Microsoft Defender detections During the first quarter of 2026 January-March, Microsoft Threat Intelligence detect...

Don’t Wait for a Patch. Mitigate RedSun Zero-Day Risk in Microsoft Defender Today

Key Takeaways RedSun is a critical zero-day vulnerability in Microsoft Defender that allows low-privileged users to gain SYSTEM access No patch is currently available, leaving all Defender-enabled Windows systems potentially exposed Qualys VMDR detects affected assets instantly QID 92382 TruRisk...

CISA Adds One Known Exploited Vulnerability to Catalog

CISA has added one new vulnerability to its Known Exploited Vulnerabilities KEV Catalog, based on evidence of active exploitation. CVE-2026-33825link is external Microsoft Defender Insufficient Granularity of Access Control Vulnerability This type of vulnerability is a frequent attack vector for...

Microsoft Defender Insufficient Granularity of Access Control Vulnerability

Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally...

Three Microsoft Defender Zero-Days Actively Exploited; Two Still Unpatched

Huntress is warning that threat actors are exploiting three recently disclosed security flaws in Microsoft Defender to gain elevated privileges in compromised systems. The activity involves the exploitation of three vulnerabilities that are codenamed BlueHammer requires GitHub sign-in, RedSun, an...

VulnCheck KEV: CVE-2026-33825

Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally...