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Findings

CVE-2023-29357

Microsoft SharePoint Server Privilege Escalation Vulnerability

Published Jun 13, 2023 · updated Jun 16, 2026 · microsoft sharepoint server

Microsoft SharePoint Server contains an unspecified vulnerability that allows an unauthenticated attacker, who has gained access to spoofed JWT authentication tokens, to use them for executing a network attack. This attack bypasses authentication, enabling the attacker to gain administrator privileges.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 13, 2023 · Catalog

    Detected

    Microsoft SharePoint Server contains an unspecified vulnerability that allows an unauthenticated attacker, who has gained access to spoofed JWT authentication tokens, to use them for executing a network attack. This attack bypasses authentication, enabling the attacker to gain administrator privileges.

  2. Jan 10, 2024 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  3. Jan 31, 2024 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  4. Jun 16, 2026 · Catalog

    Updated

    Microsoft SharePoint Server contains an unspecified vulnerability that allows an unauthenticated attacker, who has gained access to spoofed JWT authentication tokens, to use them for executing a network attack. This attack bypasses authentication, enabling the attacker to gain administrator privileges.

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

CISA due date Jan 31, 2024

Affected

  • cpe microsoft/sharepoint server2019
  • vendor Microsoft SharePoint Serverversion unspecified

Sources

  • CISA KEVCVE-2023-29357

    Microsoft SharePoint Server contains an unspecified vulnerability that allows an unauthenticated attacker, who has gained access to spoofed JWT authentication tokens, to use them for executing a network attack. This attack bypasses authentication, enabling the attacker to gain administrator privileges.

    cisa.gov
  • CVE.orgCVE-2023-29357

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2023-29357

    30-day exploitation probability 100.0%

    first.org
  • Metasploit Modulesexploit_windows/http/sharepoint_dynamic_proxy_generator_auth_bypass_rce

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDCVE-2023-29357

    Microsoft SharePoint Server Elevation of Privilege Vulnerability

    nvd.nist.gov

References