As cited
Copy frozen at (site build).
vulnerabilities
CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities
CISA confirmed active exploitation of three Microsoft SharePoint Server vulnerabilities (CVE-2026-32201, CVE-2026-45659, CVE-2026-56164) affecting on-premises deployments across all supported versions. Two additional high-severity flaws (CVE-2026-55040 and CVE-2026-58644) were disclosed July 14-15, 2026, with CVE-2026-58644 confirmed exploited in the wild. Attackers chain these flaws to gain unauthorized access, achieve remote code execution, steal IIS machine keys, and deploy malware for persistence.
Why it matters: Organizations running on-premises SharePoint Server 2016, 2019, or Subscription Edition face immediate risk from active attacks; patching all five vulnerabilities and applying Microsoft Defender signatures is critical to prevent remote compromise and lateral movement.
- Source published
- First seen by Cybersecurity Tracker
Source attribution
Correction
Correction recorded as of .
vulnerabilities
CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities
No summary had been written when this copy was frozen.
- First seen by Cybersecurity Tracker
Source attribution
Correction
Correction recorded as of .
vulnerabilities
CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities
Cybersecurity and Infrastructure Security Agency (CISA) confirmed active exploitation of four Microsoft SharePoint Server vulnerabilities, including CVE-2026-32201, CVE-2026-45659, CVE-2026-56164, and CVE-2026-58644, which attackers chain together to compromise on-premises deployments. The flaws enable spoofing, remote code execution (RCE), and privilege escalation, with attackers using them to steal IIS machine keys and establish persistence. Microsoft has released patches for all five vulnerabilities in the alert, with detection signatures available for three of them.
Why it matters: Organizations operating SharePoint Server on-premises (versions 2016, 2019, and Subscription Edition) must patch immediately to block active in-the-wild attacks exploiting these critical flaws for unauthorized access and malware deployment.
- Source published
- First seen by Cybersecurity Tracker
Source attribution
Correction
Correction recorded as of .
vulnerabilities
CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities
Cybersecurity and Infrastructure Security Agency (CISA) confirmed active exploitation of four Microsoft SharePoint Server vulnerabilities, including CVE-2026-32201, CVE-2026-45659, CVE-2026-56164, and CVE-2026-58644, which attackers chain together to compromise on-premises deployments. The flaws enable spoofing, remote code execution (RCE), and privilege escalation, with attackers using them to steal IIS machine keys and establish persistence. Microsoft has released patches for all five vulnerabilities in the alert, with detection signatures available for three of them.
Why it matters: Organizations operating SharePoint Server on-premises (versions 2016, 2019, and Subscription Edition) must patch immediately to block active in-the-wild attacks exploiting these critical flaws for unauthorized access and malware deployment.
- Source published
- First seen by Cybersecurity Tracker