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    CVE-2026-78501

    Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.

    Published:Sep 17, 2026
    Last Modified:Oct 14, 2026
    EPS:Sep 17, 2026
    EPSS Score:0.00477
    CVSS Score:8.6

    Affected Products

    Vendor
    Microsoft
    Product
    365 Copilot Business Chat
    Vendor
    Microsoft
    Product
    365 Copilot Chat

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-26164 (CVSS 7.5) — Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an …
    CVE-2026-26137 (CVSS 9.9) — Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges o…
    CVE-2025-59286 (CVSS 9.3) — Improper neutralization of special elements used in a command ('command injection') in Copilot allows an unaut…
    CVE-2025-59272 (CVSS 9.3) — Improper neutralization of special elements used in a command ('command injection') in Copilot allows an unaut…
    CVE-2025-53787 (CVSS 8.2) — Microsoft 365 Copilot BizChat Information Disclosure Vulnerability…
    CVE-2025-53774 (CVSS 6.5) — Microsoft 365 Copilot BizChat Information Disclosure Vulnerability…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High