CVE-2026-45484
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
CSIRTS triage
- What
- Deserialization of untrusted data allows an authorized attacker to elevate privileges.
- Who is affected
- Authorized users of Microsoft Office SharePoint.
- Urgency
- Remediation is urgent due to the high severity rating (CVSS 8.8) despite no known exploitation.
- Action
- Apply the latest security patch for Microsoft SharePoint.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Moderate exploitation risk2.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 78% of all EPSS-scored CVEs.
Advisory coverage (1)
- highCVE-2026-45484: Microsoft SharePoint Elevation of Privilege Vulnerabilitymsrc · 2026-06-09
External references
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