CVE-2026-20963
Microsoft SharePoint Remote Code Execution Vulnerability
CVSS v3
9.8
CRITICAL
EPSS Score
4.9 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
active
SSVC status
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
CISA Known Exploited Vulnerability
- Date Added
- 2026-03-18
- Patch Due Date
- 2026-03-21
- Ransomware Use
- Unknown
Technical details
- CVSS v3 Vector
- 3.1
- Published
- 2026-01-13
- Last Modified
- 2026-04-01
Frequently asked questions
What is CVE-2026-20963?
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Is CVE-2026-20963 actively exploited?
Yes. CVE-2026-20963 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 3/21/2026.
What is the CVSS score for CVE-2026-20963?
CVE-2026-20963 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string 3.1.
Is CVE-2026-20963 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 30 free checks/month · Free API key
Other 2026 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).
- CVE-2026-24061KEV
- CVE-2026-27174MajorDoMo Unauthenticated Remote Code Execution via Admin Console Eval
- CVE-2026-1281KEV
- CVE-2026-24423KEVSmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API
- CVE-2026-1731KEVRemote code execution vulnerability in BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA)
- CVE-2026-23760KEVSmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API
- CVE-2026-22200osTicket (1.18.x < 1.18.3, 1.17.x < 1.17.7) PDF Export Arbitrary File Read
- CVE-2026-1340KEVUnauthenticated Remote Code Execution via Code Injection in Ivanti Endpoint Manager Mobile