CVE-2026-45659HIGH 8.8CISA KEVEPSS p94.8%

CVE-2026-45659Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability

Microsoft / SharePoint Server

Description

Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS9.12% probability of exploitation · percentile 94.8% · 2026-08-02T12:03:13Z
Published2026-05-22
Last modified2026-07-23

CISA KEV entry

Added to KEV: 2026-07-01

Underlying weaknesses· 1

CWE-502

References

  1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659

1

TypeTargetConfidenceTier
WeaknessDeserialization of Untrusted Datacwe-5020%live

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