CVE-2026-45484

CVE-2026-45484

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

secure@microsoft.com

Frequently asked questions

What is CVE-2026-45484?: CVE-2026-45484 is a high-severity vulnerability, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-06-09.
How severe is CVE-2026-45484?: High severity. CVSS v3 base score is 8.8 out of 10.