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    CVE-2026-20963

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

    Published:Jan 13, 2026
    Last Modified:Apr 2, 2026
    EPS:Jan 13, 2026
    EPSS Score:0.06169
    CVSS Score:9.8

    CISA Notification

    Description

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

    Required Action:

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

    Notes:

    No extra notes provided.

    Due Date
    Mar 21, 2026
    174 days ago
    Alert Date
    Mar 18, 2026
    177 days ago

    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