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CVE-2026-42824 Microsoft CVE debrief

CVE-2026-42824 is a medium-severity vulnerability in Microsoft Copilot, a product within the Microsoft 365 suite. The vulnerability, which has a CVSS score of 6.5, is caused by improper neutralization of special elements used in a command, also known as command injection. This allows an unauthorized attacker to disclose information over a network. The vulnerability was first published on [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-42824) on 2026-06-04 and last modified on 2026-06-08.

Vendor
Microsoft
Product
Copilot
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-07-23
Advisory published
2026-06-04
Advisory updated
2026-07-23

Who should care

Security teams and administrators responsible for Microsoft 365 Copilot should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability exists in Microsoft Copilot and is caused by improper neutralization of special elements used in a command. This allows an attacker to inject commands and disclose information over a network. The vulnerability has a CVSS score of 6.5 and is classified as CWE-77.

Defensive priority

Medium

Recommended defensive actions

  • Apply patches or updates provided by Microsoft as soon as possible.
  • Review and restrict network access to Microsoft 365 Copilot.
  • Monitor for suspicious activity and implement additional security measures if necessary.

Evidence notes

The vulnerability is analyzed and has a vendor advisory available on the [Microsoft Security Response Center](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42824).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42824 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42824

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

  • CVE-2026-42824 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42824

    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.