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PatchSiren cyber security CVE debrief

CVE-2026-45481 Microsoft CVE debrief

CVE-2026-45481 is a HIGH-severity vulnerability (CVSS Score: 7.3) affecting Microsoft Office SharePoint. The vulnerability is caused by improper neutralization of input during web page generation, allowing for cross-site scripting (XSS) attacks. An authorized attacker can exploit this vulnerability to perform spoofing over a network.

Vendor
Microsoft
Product
Office SharePoint
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-12
Advisory published
2026-06-09
Advisory updated
2026-06-12

Who should care

Administrators and users of Microsoft Office SharePoint should be aware of this vulnerability and take necessary precautions to mitigate the risk.

Technical summary

The vulnerability is caused by improper neutralization of input during web page generation, allowing for cross-site scripting (XSS) attacks. This vulnerability has a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable systems.
  • Implement additional security measures, such as input validation and output encoding, to prevent XSS attacks.
  • Monitor systems for suspicious activity and implement incident response plans in case of a potential attack.

Evidence notes

The vendor is identified as 'Unknown Vendor' with low confidence, and evidence suggests the product may be related to Microsoft.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45481 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45481

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

  • CVE-2026-45481 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45481

    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.