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CVE-2026-55051 Microsoft CVE debrief

CVE-2026-55051 is a server-side request forgery (SSRF) vulnerability in Microsoft Office SharePoint. An authorized attacker can exploit this vulnerability to disclose information over a network. The vulnerability has a CVSS score of 6.5 and a severity rating of MEDIUM. Affected product deployments should be reviewed for potential exposure, and owners should be assigned for follow-up. The CVE record was published on 2026-07-14T18:18:17.153Z and has not been modified since then. This vulnerability may impact SharePoint Server users and administrators, and they should review and apply patches to prevent potential information disclosure.

Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

Microsoft SharePoint Server users and administrators should review and apply patches to prevent potential information disclosure. They should also monitor SharePoint Server instances for potential SSRF attacks and review compensating controls for exposed systems while remediation is scheduled and verified. Additionally, they should check relevant monitoring, detection, and logs for exposed assets that need extra review.

Technical summary

CVE-2026-55051 is a server-side request forgery (SSRF) vulnerability in Microsoft Office SharePoint. An authorized attacker can exploit this vulnerability to disclose information over a network. The vulnerability has a CVSS score of 6.5 and a severity rating of MEDIUM. Affected product context and defensive impact should be considered when reviewing and applying patches.

Defensive priority

Apply patches and monitor SharePoint Server instances for potential SSRF attacks. Review compensating controls for exposed systems while remediation is scheduled and verified.

Recommended defensive actions

  • Apply the patch provided by Microsoft to vulnerable SharePoint Server instances.
  • Review and update SharePoint Server configurations to ensure they are secure.
  • Monitor SharePoint Server instances for potential SSRF attacks.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, including its CVSS score and severity rating. The vendor advisory provides a patch for the vulnerability. However, the affected scope, severity, and vendor guidance should be validated with the official advisory or CVE record. Defenders should verify the existence of affected product deployments in managed environments and assign an owner for follow-up.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-55051 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-55051

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

  • CVE-2026-55051 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-55051

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

Supplemental references

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.