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CVE-2026-55051: Microsoft SharePoint Server Information Disclosure Vulnerability

mediumCVSS 6.5CVE-2026-55051
Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoftproduct: SharePoint ServerServer-side request forgeryInformation disclosure
What
Server-side request forgery in SharePoint allows authorized information disclosure over a network.
Who is affected
Authorized users of Microsoft Office SharePoint.
Urgency
Remediation is medium priority due to the medium severity and potential for information disclosure.
Action
Apply the recommended security updates for SharePoint Server.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 6.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55051

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-55051coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Microsoft SharePoint Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center