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PatchSiren cyber security CVE debrief

CVE-2026-45454 Microsoft CVE debrief

CVE-2026-45454 is a path traversal vulnerability in Microsoft Office SharePoint. An authorized attacker can exploit this vulnerability to execute code over a network. The vulnerability has a CVSS score of 6.5 and a severity of MEDIUM.

Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-10
Advisory published
2026-06-09
Advisory updated
2026-06-10

Who should care

Administrators and users of Microsoft Office SharePoint should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is caused by improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Office SharePoint. This allows an authorized attacker to execute code over a network.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply the patch from Microsoft as soon as possible.
  • Refer to the vendor advisory for more information: [ref-4](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45454).

Evidence notes

The vulnerability is analyzed and has a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45454 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45454

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

  • CVE-2026-45454 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45454

    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.