CVE-2026-88204 Microsoft Office SharePoint - Stored XSS

Microsoft Office SharePoint contains a stored XSS caused by improper neutralization of input during web page generation, letting authorized attackers perform spoofing over a network, exploit requires attacker to be authorized.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.62% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored XSS
Impact
Stored XSS
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to the latest version of Microsoft Office SharePoint.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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