CVE Feed

    Dashboard / CVE / CVE-2026-42831

    CVE-2026-42831

    Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

    Published:May 12, 2026
    Last Modified:May 22, 2026
    EPS:May 12, 2026
    EPSS Score:0.00062
    CVSS Score:7.8

    Affected Products

    Vendor
    Microsoft
    Product
    365 Copilot
    Vendor
    Microsoft
    Product
    Office
    Vendor
    Microsoft
    Product
    Office For Android
    Vendor
    Microsoft
    Product
    Office Long Term Servicing Channel
    Vendor
    Microsoft
    Product
    Office Macos 2021
    Vendor
    Microsoft
    Product
    Office Macos 2024

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-50517 (CVSS 9.9) — Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network…
    CVE-2026-41106 (CVSS 9.3) — Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate…
    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-2026-54130 (CVSS 9.8) — Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose infor…
    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-2026-41614 (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