Microsoft Office SharePoint
CVE-2026-45484 — Microsoft SharePoint Elevation of Privilege Vulnerability
Executive Summary
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.7
EPSS Score
0.01489
probability of exploitation in the next 30 days
0.70724 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
3 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft SharePoint Enterprise Server 2016 | 5002880 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft SharePoint Server 2019 | 5002874 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft SharePoint Server Subscription Edition | 5002873 (Security Update) |
Important | Elevation of Privilege | Maybe |
Patches
3 patches
| Article | Type | Restart |
|---|---|---|
5002880 |
Security Update | Maybe |
5002874 |
Security Update | Maybe |
5002873 |
Security Update | Maybe |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
GMO Cybersecurity by Ierae, Inc., hamayanhamayan
References
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