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CVE-2026-69690 Microsoft CVE debrief

A spoofing vulnerability exists in Microsoft Office SharePoint, an authorized attacker could perform spoofing over a network by improper neutralization of input during web page generation. Defenders responsible for SharePoint Server Subscription Edition deployments should assess exposure and apply patches. The CVE Program and NVD provide official records of the vulnerability. Microsoft provides a vendor advisory with patch information. Verify exposure of SharePoint Server Subscription Edition and apply vendor patches to prevent spoofing. Monitor for suspicious activity.

Vendor
Microsoft
Product
Microsoft SharePoint Server Subscription Edition
CVSS
MEDIUM 4.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-10-08
Advisory published
2026-09-08
Advisory updated
2026-10-08

Who should care

Defenders responsible for SharePoint Server Subscription Edition deployments should assess exposure and apply patches. Defenders should prioritize verifying exposure of SharePoint Server Subscription Edition and applying vendor patches. The vulnerability affects Microsoft Office SharePoint. Verify exposure of SharePoint Server Subscription Edition and apply vendor patches to prevent spoofing. Monitor for suspicious ,

Why it matters

A spoofing vulnerability exists in Microsoft Office SharePoint, allowing an authorized attacker to perform spoofing over a network. Defenders responsible for SharePoint Server Subscription Edition deployments should assess exposure and apply patches.

  • Verify exposure of SharePoint Server Subscription Edition
  • Apply vendor patches to prevent spoofing
  • Monitor for suspicious activity

Technical summary

The vulnerability exists due to improper neutralization of input during web page generation, allowing an authorized attacker to perform spoofing over a network. The vulnerability affects Microsoft Office SharePoint. Defenders should prioritize verifying exposure of SharePoint Server Subscription Edition and applying vendor patches. The official CVE Program record and NVD vulnerability detail provide additional information on the vulnerability.

Defensive priority

Defenders should prioritize verifying exposure of SharePoint Server Subscription Edition and applying vendor patches.

Recommended defensive actions

  • Verify exposure of SharePoint Server Subscription Edition
  • Apply vendor patches
  • Monitor for suspicious activity

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft provides a vendor advisory with patch information. The vulnerability exists due to improper neutralization of input during web page generation, allowing an authorized attacker to perform spoofing over a network. Defenders should prioritize verifying exposure of SharePoint Server Subscription Edition and applying vendor patches. The official CVE Program record and NVD vulnerability detail provide additional

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69690 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69690

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-69690 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69690

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Microsoft Office SharePoint Spoofing Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/69xxx/CVE-2026-69690.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69690

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.