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CVE-2026-45453

Microsoft SharePoint Server Spoofing Vulnerability

MEDIUM
5.4
CVSS Score
Published: June 9, 2026 at 05:04 PM UTC
Updated: July 23, 2026 at 07:32 PM UTC
4 products affected across 1 vendorSharePoint ServerSharePoint Server 2019SharePoint Enterprise Server 2016

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SharePoint Server· Microsoft
95%
v < 16.0.19725.2038416.0.0 ≤ v < 16.0.19725.2038420162019
Affected range stops below 16.0.19725.20384, so it looks safe — our inference, not a vendor statement
SharePoint Enterprise Server 2016· Microsoft
60%
16.0.0 ≤ v < 16.0.5556.100516.0.0
Affected range stops below 16.0.5556.1005, so it looks safe — our inference, not a vendor statement
SharePoint Server 2019· Microsoft
60%
16.0.0 ≤ v < 16.0.10417.2015316.0.0
Affected range stops below 16.0.10417.20153, so it looks safe — our inference, not a vendor statement
SharePoint Server Subscription Edition· Microsoft
60%
16.0.0 ≤ v < 16.0.19725.2038416.0.0
Affected range stops below 16.0.19725.20384, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45453

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMmicrosoft
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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