Exhibit A(I): CISA warns of active exploitation of Microsoft SharePoint vulnerability (CVE-2026-20963)

The Cybersecurity and Infrastructure Security Agency (CISA) has warned organizations about the active exploitation of a critical vulnerability in

Exhibit A(I): CISA warns of active exploitation of Microsoft SharePoint vulnerability (CVE-2026-20963)

The Cybersecurity and Infrastructure Security Agency (CISA) has warned organizations about the active exploitation of a critical vulnerability in Microsoft SharePoint, designated CVE-2026-20963. This remote code execution (RCE) flaw was patched in January 2026, but attackers are exploiting it swiftly.

What to do this week

  1. Ensure that your SharePoint installations are updated to the latest version.
  2. Verify that your cybersecurity protocols are robust enough to handle potential attacks related to this vulnerability.
  3. Increase awareness among your teams about phishing attempts that may arise following this warning.

Sources