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9.8
CVSS
Critical

CVE-2026-20963

PUBLISHED

Microsoft SharePoint Remote Code Execution Vulnerability

1 day faster than CISA KEV

Exploited in the wild PoC available Remote Low complexity No user interaction
Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition
Published
Jan 13, 2026
EPSS
5.3% · 90% pctl

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Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

cisa microsoft

Weaknesses (CWE)

  • CWE-502

    Deserialization of Untrusted Data

CVSS scores

CVSS v3.1 9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation status

Exploited in the wild

Recorded 2026-06-01 12:10:26 UTC · CVE

Proof of concept available

Recorded 2026-03-27 21:03:46 UTC · GitHub

References

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source Added
CVE First 2026-06-01 12:10 UTC
CISA 2026-06-02 14:02 UTC

Potential proof of concepts

These PoCs are unverified and could contain malware. Use at your own risk.

jenniferreire26/CVE-2026-20963

github · Created 2026-03-27 21:03:46 UTC · 1 stars

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Proof of Concept Exploit Available

  • Added to KEVIntel

  • KEV confirmed by CISA