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Microsoft Security Response CenterCVE-2026-26129

M365 Copilot Information Disclosure Vulnerability

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Read the vendor bulletin Get alerts for Microsoft 365 Copilot's Business Chat
7.5CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • Microsoft 365 Copilot's Business Chat
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-26129View CVSS, KEV, EPSS, and threat context
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