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PatchSiren cyber security CVE debrief

CVE-2026-64902 Microsoft CVE debrief

A spoofing vulnerability exists in Microsoft SharePoint Server, an authorized attacker could perform spoofing over a network. The vulnerability requires defenders to verify affected versions, apply patches, and monitor for suspicious activity. This vulnerability impacts SharePoint Server deployments, requiring immediate attention from defenders responsible for these systems. Defenders should assess exposure and prioritize patching to prevent exploitation. The vulnerability exists due to improper neutralization of input during web page generation in Microsoft Office SharePoint.

Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016
CVSS
MEDIUM 4.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-10-08
Advisory published
2026-08-11
Advisory updated
2026-10-08

Who should care

Defenders responsible for Microsoft SharePoint Server deployments should assess exposure and prioritize patching. This includes verifying affected versions, applying patches, and monitoring for suspicious activity. Defenders should also review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

A spoofing vulnerability in Microsoft SharePoint Server requires defenders to verify affected versions, apply patches, and monitor for suspicious activity.

  • Verify and apply patches to prevent exploitation
  • Monitor for suspicious activity
  • Assess exposure of SharePoint Server deployments

Technical summary

The vulnerability exists due to improper neutralization of input during web page generation in Microsoft Office SharePoint. An authorized attacker could perform spoofing over a network. The vulnerability requires defenders to verify affected versions, apply patches, and monitor for suspicious activity. Defenders should prioritize verifying affected SharePoint Server versions and applying vendor patches.

Defensive priority

Defenders should prioritize verifying affected SharePoint Server versions and applying vendor patches.

Recommended defensive actions

  • Verify affected SharePoint Server versions
  • Apply vendor patches
  • Monitor for suspicious activity

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the vulnerability. The vulnerability was publicly disclosed on 2026-08-11T17:06:35.996Z and has not been modified since then. The CVE record and NVD detail page provide additional information on the vulnerability. Defenders should verify affected SharePoint Server versions and apply vendor patches.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-64902 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-64902

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

  • CVE-2026-64902 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-64902

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

Supplemental references

  • Microsoft SharePoint Server Spoofing Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/64xxx/CVE-2026-64902.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64902

    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.