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Vulnerabilities

Vulnerability · CVE-2026-88204

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

Published Oct 13, 2026 · catalog updated Oct 14, 2026 · Microsoft SharePoint

Check if you run it

No confirmed exploitation is on record for CVE-2026-88204. EPSS is 0.63%. Act only if a listed version of Microsoft SharePoint is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.63%
Remediation
Advisory link
Affected products
cpe microsoft/sharepoint server · microsoft Microsoft SharePoint Server Subscription Edition

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/sharepoint serverversion unspecified
  • microsoft Microsoft SharePoint Server Subscription Editionversion unspecified

How to fix CVE-2026-88204

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-88204. EPSS is 0.63%. Act only if a listed version of Microsoft SharePoint is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.63%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-88204

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-88204

    30-day exploitation probability 0.6%

    first.org
  • Microsoft Security Update GuideVendor advisoryCVE-2026-88204

    Microsoft SharePoint Server Subscription Edition

    msrc.microsoft.com
  • NIST NVDVulnerability recordCVE-2026-88204

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.