CVE-2026-20963
Known exploited · CISA KEV
CVSS 8.8 HIGH: deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a… EPSS 33% (98th percentile).
CISA federal remediation date Mar 21
Vulnerabilities & Exploits · Web App Attack
Attackers are exploiting CVE-2026-20963, a critical remote-code-execution flaw in Microsoft SharePoint Server 2016, 2019, and Subscription Edition.
3 sources · Mar 19
Known exploited · CISA KEV
CVSS 8.8 HIGH: deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a… EPSS 33% (98th percentile).
CISA federal remediation date Mar 21
Help Net Security
CISA warns of active exploitation of Microsoft SharePoint vulnerability (CVE-2026-20963) - Help Net Security
CVE-2026-20963, a remote code execution (RCE) SharePoint vulnerability Microsoft fixed in January 2026, is being exploited by attackers.
originalSecurityWeek
CISA Warns of Attacks Exploiting Recent SharePoint Vulnerability
The SharePoint remote code execution vulnerability CVE-2026-20963, which Microsoft patched in January, has been exploited in the wild.
originalBleepingComputer
Critical Microsoft SharePoint flaw now exploited in attacks
A critical Microsoft SharePoint vulnerability patched in January is now being exploited in attacks, the Cybersecurity and Infrastructure Security Agency (CISA) warned.
originalPart of the PlainSec briefing for 2026-03-19
Every edition of this story: Microsoft SharePoint RCE CVE-2026-20963 Exploited In the Wild