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Vulnerability record · CVE-2026-42895 · published 19 June 2026

CVE-2026-42895: Microsoft 365 copilot command injection vulnerability

Microsoft · 365 Copilot

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network.

7.5 CVSS 3.1 High EPSS 0.71% · top 48.5% CWE-77 · Command injection
7.5CVSS 3.1 base score
0.71%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
26 Jun 2026Last modified by NVD

Description

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42895 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2026-50517Microsoft 365 copilot deserialization of untrusted data vulnerabilityDeserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.EPSS 1.7%9.8CVE-2026-58617Microsoft 365 copilot improper access control vulnerabilityImproper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.EPSS 0.79%9.8CVE-2025-60724Microsoft 365 copilot heap-based buffer overflow vulnerabilityHeap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.EPSS 5.9%9.8CVE-2025-53766Microsoft 365 copilot heap-based buffer overflow vulnerabilityHeap-based buffer overflow in Windows GDI+ allows an unauthorized attacker to execute code over a network.EPSS 8.0%9.6CVE-2026-48561Microsoft 365 copilot command injection vulnerabilityImproper neutralization of special elements used in a command ('command injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker …EPSS 0.86%9.6CVE-2021-43905Microsoft 365 copilot vulnerabilityMicrosoft Office app Remote Code Execution VulnerabilityEPSS 2.8%9.3CVE-2026-41106Microsoft 365 copilot open redirect vulnerabilityUrl redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate privileges over a network.EPSS 0.72%9.3CVE-2026-41090Microsoft 365 copilot command injection vulnerabilityImproper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform t…EPSS 0.76%

Source: NIST National Vulnerability Database (record CVE-2026-42895), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.