CVE-2026-109454 Microsoft Office SharePoint Spoofing Vulnerability

CriticalCVSS 9.0

Published: 2026-11-10 20:15
Updated: 2026-11-11 01:46
Exploit status: No public exploit known

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

Affected products

Product	Affected versions	Fixed in
Microsoft sharepoint server	< 16.0.20326.20278	16.0.20326.20278
Microsoft SharePoint Server Subscription Edition	>= 16.0.0, < 16.0.20326.20278	16.0.20326.20278

References

MSRC Security Update Guide patch vendor-advisory
KB5002945 patch
KB5002945 vendor-advisory

CVSS v3.1

9.0 Critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Changed
Confidentiality: High
Integrity: High
Availability: High
Exploit Code Maturity: Unproven
Remediation Level: Official Fix
Report Confidence: Confirmed

Weakness & likelihood

EPSS (exploitation probability, 30 days): Not available
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

Metadata only. CVERadar never hosts or runs exploit code.

No public exploit references known.