CVE-2026-88209 | BDVDB-2026-387752 Detail

MicrosoftMicrosoft SharePoint Server Subscription Edition

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.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References#

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88209

Exploit#

No public exploit known

History#

Version 12026-10-13Record published in the CVE List.
Version 22026-10-31Most recent update recorded in the CVE List.

Published

Published: 2026-10-13
Last modified: 2026-10-31

Vendor information

Vendor: Microsoft
Product: Microsoft SharePoint Server Subscription Edition

All Microsoft vulnerabilities

Score

4.6 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 30.3.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Scripting

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 16.0.0 and < 16.0.20326.20190
Fixed
16.0.20326.20190

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.6 Medium

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	Required
Scope	Unchanged
Confidentiality	Low
Integrity	Low
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).