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CVE-2026-45465 Microsoft CVE debrief

CVE-2026-45465 is a MEDIUM-severity vulnerability (CVSS Score: 5.4) affecting Microsoft Office SharePoint. This vulnerability, published on [cvePublishedAt], allows an authorized attacker to perform spoofing over a network due to improper neutralization of input during web page generation, also known as cross-site scripting (XSS).

Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016
CVSS
MEDIUM 5.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-09
Advisory published
2026-06-09
Advisory updated
2026-07-09

Who should care

Administrators and users of Microsoft Office SharePoint Server, particularly those with versions 2016, 2019, and Subscription editions, should be aware of this vulnerability.

Technical summary

The vulnerability exists in Microsoft Office SharePoint Server due to insufficient input validation, allowing an attacker to inject malicious scripts into web pages. This can lead to spoofing attacks, where an attacker can deceive users into performing unintended actions or revealing sensitive information.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable SharePoint Server versions.
  • Implement proper input validation and output encoding for user-supplied data.
  • Restrict access to sensitive areas of the SharePoint site to authorized users only.
  • Monitor SharePoint Server logs for suspicious activity.

Evidence notes

The CVE-2026-45465 record was obtained from the official CVE database and the National Vulnerability Database (NVD).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45465 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45465

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

  • CVE-2026-45465 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45465

    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.