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PatchSiren cyber security CVE debrief

CVE-2026-48561 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T17:16:49.753Z and has not been modified since then. The NVD entry is currently Analyzed. This critical command injection vulnerability in Microsoft 365 Copilot has a CVSS score of 9.6, allowing an unauthorized attacker to execute code over a network. Security teams responsible for Microsoft 365 Copilot deployments should assess and mitigate CVE-2026-48561. The vulnerability's critical severity and potential for remote code execution make it a high priority for security teams to address.

Vendor
Microsoft
Product
365 Copilot
CVSS
CRITICAL 9.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-26
Advisory published
2026-07-14
Advisory updated
2026-07-26

Who should care

Security teams responsible for Microsoft 365 Copilot deployments, vulnerability management teams, and security teams should assess and mitigate CVE-2026-48561, a critical command injection vulnerability. The vulnerability's critical severity and potential for remote code execution make it a high priority for security teams to address. Operators and platform security teams should also be aware of the vulnerability's impact and take necessary precautions.

Technical summary

CVE-2026-48561 is a critical command injection vulnerability in Microsoft 365 Copilot, with a CVSS score of 9.6 and rated as CRITICAL. It allows an unauthorized attacker to execute code over a network. The vulnerability has been identified in Microsoft 365 Copilot deployments, and security teams should assess and mitigate it. The CVE record and NVD detail provide official information about the vulnerability.

Defensive priority

High priority due to critical severity and potential for remote code execution. Security teams should assess and mitigate CVE-2026-48561 immediately.

Recommended defensive actions

  • Assess Microsoft 365 Copilot deployments for vulnerability
  • Apply vendor patches or mitigations
  • Monitor for suspicious activity
  • Implement compensating controls
  • Verify inventory and configurations

Evidence notes

The CVE record and NVD detail provide official information about the vulnerability. Vendor advisory is available from Microsoft. The vulnerability has been identified in Microsoft 365 Copilot, and security teams should assess and mitigate it. Evidence from the CVE record and NVD detail indicates a critical severity vulnerability with a CVSS score of 9.6, allowing unauthorized attackers to execute code over a network. Defenders should verify inventory and configurations, and monitor for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48561 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48561

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

  • CVE-2026-48561 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48561

    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.