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 · 180 days ago
CVE-2026-20963, a critical SharePoint remote-code-execution flaw patched by Microsoft in January, is being exploited in the wild. CISA added the vulnerability to its Known Exploited Vulnerabilities catalog and set a federal remediation deadline.
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
3 sources covering this story
CVE-2026-20963, a remote code execution (RCE) SharePoint vulnerability Microsoft fixed in January 2026, is being exploited by attackers.
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.
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.
Part of the PlainSec briefing for 2026-03-25