Microsoft CVE-2026-20963
CRITICALCVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AnalysisAI
Microsoft Office SharePoint contains a deserialization vulnerability (CVE-2026-20963) that allows authenticated users to execute arbitrary code over the network through crafted serialized objects. KEV-listed with public PoC, this CVSS 8.8 vulnerability enables any SharePoint user to escalate to server-level code execution, making it a critical threat for organizations relying on SharePoint for document management and collaboration.
Sign in for full analysis, threat intelligence, and remediation guidance.
RemediationAI
Within 24 hours: Identify all affected systems and apply vendor patches immediately. Restrict deserialization to trusted data sources and implement integrity checks.
Sign in for detailed remediation steps.
More from same product – last 7 days
Remote code execution in Microsoft Azure Orbital Spatio allows unauthenticated network attackers to upload dangerous fil
Unsafe deserialization in Microsoft Planetary Computer Pro (Geocatalog) lets a remote unauthenticated attacker craft mal
Remote code execution in Microsoft Power Pages allows unauthenticated network attackers to inject and execute operating-
Privilege elevation in Microsoft Azure Resource Manager (ARM) allows remote unauthenticated attackers to bypass authenti
Privilege escalation in Microsoft Entra ID enables remote unauthenticated attackers to bypass origin validation and gain
Share
External POC / Exploit Code
Leaving vuln.today