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HIGH · 7.3

CVE-2026-55021

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.

Vulnerability 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.

CVSS Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE

Affected Products

VendorProductVersions
MicrosoftSharepoint Server< 16.0.19725.20434

Related Weaknesses (CWE)

CWE-79

References

FAQ

What is CVE-2026-55021?

CVE-2026-55021 is a vulnerability with a CVSS score of 7.3 (HIGH). 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.

How severe is CVE-2026-55021?

CVE-2026-55021 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-55021?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Sharepoint Server.