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    CVE-2026-54130

    Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

    Published:Jun 18, 2026
    Last Modified:Jun 22, 2026
    EPS:Jun 18, 2026
    EPSS Score:
    CVSS Score:9.8

    Affected Products

    Vendor
    Microsoft
    Product
    365 Copilot

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-47645 (CVSS 8.8) — Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unautho…
    CVE-2026-42895 (CVSS 6.5) — Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allow…
    CVE-2026-45497 (CVSS 7.7) — Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allow…
    CVE-2026-42824 (CVSS 6.5) — Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an …
    CVE-2026-41090 (CVSS 9.3) — Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allow…
    CVE-2026-42827 (CVSS 6.5) — Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an …
    CVE-2026-42831 (CVSS 7.8) — Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.…
    CVE-2026-41614 (CVSS 6.2) — Improper access control in M365 Copilot for Desktop allows an unauthorized attacker to perform spoofing locall…

    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