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CVE-2026-45454: Microsoft SharePoint Remote Code Execution Vulnerability

mediumCVSS 6.5CVE-2026-45454
Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: SharePointRemote code executionPath traversal
What
Improper limitation of a pathname allows an authorized attacker to execute code.
Who is affected
Authorized users of Microsoft Office SharePoint are affected.
Urgency
Remediation is urgent due to the potential for remote code execution.
Action
Apply the latest security patch for Microsoft SharePoint.

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
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45454

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-2026-45454coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft SharePoint Remote

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