Microsoft Discloses Actively Exploited Defender Vulnerabilities

Microsoft warns of two critical vulnerabilities in its Defender software, one of which is being actively exploited by attackers to gain elevated privileges, and the other causing denial-of-service issues. These flaws, tracked as CVE-2026-41091 and CVE-2026-45498, highlight the need for urgent patching to…

https://osintsights.com/microsoft-discloses-actively-exploited-defender-vulnerabilities?utm_source=mastodon&utm_medium=social

#MicrosoftDefender #VulnerabilityExploitation #LocalPrivilegeEscalation #Cve202641091 #Cve202645498

Microsoft Disrupts Zero-Day Attacks with Defender Patch Rollout

Microsoft is taking swift action to protect its users from zero-day attacks with an emergency patch rollout for its Defender software, ensuring that even the most vulnerable systems are safeguarded. The update addresses two critical vulnerabilities that were being actively exploited by hackers.

https://osintsights.com/microsoft-disrupts-zero-day-attacks-with-defender-patch-rollout?utm_source=mastodon&utm_medium=social

#ZeroDay #MicrosoftDefender #Cve202641091 #Cve202645498 #EmergingThreats

🚨 [CISA-2026:0520] CISA Adds 7 Known Exploited Vulnerabilities to Catalog (https://secdb.nttzen.cloud/security-advisory/detail/CISA-2026:0520)

CISA has added 7 new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation. These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risk to the federal enterprise.

⚠️ CVE-2008-4250 (https://secdb.nttzen.cloud/cve/detail/CVE-2008-4250)
- Name: Microsoft Windows Buffer Overflow Vulnerability
- Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Known To Be Used in Ransomware Campaigns? Unknown
- Vendor: Microsoft
- Product: Windows
- Notes: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-067 ; https://nvd.nist.gov/vuln/detail/CVE-2008-4250

⚠️ CVE-2009-1537 (https://secdb.nttzen.cloud/cve/detail/CVE-2009-1537)
- Name: Microsoft DirectX NULL Byte Overwrite Vulnerability
- Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Known To Be Used in Ransomware Campaigns? Unknown
- Vendor: Microsoft
- Product: DirectX
- Notes: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-028 ; https://nvd.nist.gov/vuln/detail/CVE-2009-1537

⚠️ CVE-2009-3459 (https://secdb.nttzen.cloud/cve/detail/CVE-2009-3459)
- Name: Adobe Acrobat and Reader Heap-Based Buffer Overflow Vulnerability
- Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Known To Be Used in Ransomware Campaigns? Unknown
- Vendor: Adobe
- Product: Acrobat and Reader
- Notes: https://www.cisa.gov/news-events/alerts/2009/10/13/adobe-reader-and-acrobat-vulnerabilities ; https://web.archive.org/web/20120324170253/http://www.adobe.com/support/security/bulletins/apsb09-15.html#:~:text=CVE%2D2009%2D3459).-,NOTE%3A,-There%20are%20reports ; https://nvd.nist.gov/vuln/detail/CVE-2009-3459

⚠️ CVE-2010-0249 (https://secdb.nttzen.cloud/cve/detail/CVE-2010-0249)
- Name: Microsoft Internet Explorer Use-After-Free Vulnerability
- Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Known To Be Used in Ransomware Campaigns? Unknown
- Vendor: Microsoft
- Product: Internet Explorer
- Notes: https://learn.microsoft.com/en-us/security-updates/SecurityAdvisories/2010/979352 ; https://nvd.nist.gov/vuln/detail/CVE-2010-0249

⚠️ CVE-2010-0806 (https://secdb.nttzen.cloud/cve/detail/CVE-2010-0806)
- Name: Microsoft Internet Explorer Use-After-Free Vulnerability
- Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Known To Be Used in Ransomware Campaigns? Unknown
- Vendor: Microsoft
- Product: Internet Explorer
- Notes: https://learn.microsoft.com/en-us/security-updates/securityadvisories/2010/981374 ; https://nvd.nist.gov/vuln/detail/CVE-2010-0806

⚠️ CVE-2026-41091 (https://secdb.nttzen.cloud/cve/detail/CVE-2026-41091)
- Name: Microsoft Defender Link Following Vulnerability
- Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Known To Be Used in Ransomware Campaigns? Unknown
- Vendor: Microsoft
- Product: Defender
- Notes: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-41091 ; https://nvd.nist.gov/vuln/detail/CVE-2026-41091

⚠️ CVE-2026-45498 (https://secdb.nttzen.cloud/cve/detail/CVE-2026-45498)
- Name: Microsoft Defender Denial of Service Vulnerability
- Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Known To Be Used in Ransomware Campaigns? Unknown
- Vendor: Microsoft
- Product: Defender
- Notes: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-45498 ; https://nvd.nist.gov/vuln/detail/CVE-2026-45498

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