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    CVE-2026-40357

    Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

    Published:May 12, 2026
    Last Modified:May 13, 2026
    EPS:May 12, 2026
    EPSS Score:0.00503
    CVSS Score:8.8

    Affected Products

    Vendor
    Microsoft
    Product
    Sharepoint Server
    Vendor
    Microsoft
    Product
    Sharepoint Server 2016
    Vendor
    Microsoft
    Product
    Sharepoint Server 2019

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-586 Object Injection

    Related CVEs

    CVE-2026-69465 (CVSS 8.8) — Missing authorization in Microsoft Office SharePoint allows an authorized attacker to execute code over a netw…
    CVE-2026-69904 (CVSS 3.5) — Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to disclose in…
    CVE-2026-69636 (CVSS 6.5) — Improper neutralization of special elements used in an sql command ('sql injection') in Microsoft Office Share…
    CVE-2026-69464 (CVSS 8.8) — Execution with unnecessary privileges in Microsoft Office SharePoint allows an authorized attacker to elevate …
    CVE-2026-69615 (CVSS 3.5) — Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Share…
    CVE-2026-69417 (CVSS 7.3) — Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Share…
    CVE-2026-69409 (CVSS 6.5) — Execution with unnecessary privileges in Microsoft Office SharePoint allows an authorized attacker to disclose…
    CVE-2026-69402 (CVSS 7.3) — Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Share…
    CVE-2026-69282 (CVSS 8.8) — Improper access control in Microsoft Office SharePoint allows an authorized attacker to execute code over a ne…
    CVE-2026-69273 (CVSS 8.8) — Improper access control in Microsoft Office SharePoint allows an authorized attacker to execute code over a ne…

    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