CVE-2026-20963CRITICAL 9.8CISA KEVEPSS p98.0%

CVE-2026-20963Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Microsoft / SharePoint

Description

Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS31.11% probability of exploitation · percentile 98.0% · 2026-06-19T12:03:05Z
Published2026-01-13
Last modified2026-04-01

CISA KEV entry

Added to KEV: 2026-03-18

Underlying weaknesses· 1

CWE-502

References

  1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963
  2. https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20963

1

TypeTargetConfidenceTier
WeaknessDeserialization of Untrusted Datacwe-5020%live

(incoming)1

TypeTargetConfidenceTier
KEVEntryMicrosoft SharePoint Deserialization of Untrusted Data Vulnerabilitykev-cve-2026-209630%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Microsoft SharePoint Deserialization Vulnerability
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.