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CVE-2026-56164

Microsoft SharePoint Server Elevation of Privilege Vulnerability

Published
Last modified
published
Listed in CISA KEV
Fix
Fixed in 16.0.5561.1001, 16.0.10417.20175, 16.0.19725.20434
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: active
  • Automatable: yes
  • Technical impact: partial

Summary

Microsoft SharePoint Server is affected by this vulnerability, which lets an unauthorized attacker reach a critical function without authentication. A successful attack over a network could allow the attacker to gain higher privileges than they should have on the server.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original description

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

Timeline

  1. Added to CISA KEV

    CISA has evidence of exploitation in the wild

  2. CVE published
  3. CISA SSVC assessment

    Exploitation: active · Automatable: yes · Technical impact: partial

  4. CISA remediation deadline

    Due date for US federal agencies to patch

  5. Record last updated

Affected versions

  • Microsoft Microsoft SharePoint Enterprise Server 2016

    From 16.0.0 · fixed in 16.0.5561.1001

  • Microsoft Microsoft SharePoint Server 2019

    From 16.0.0 · fixed in 16.0.10417.20175

  • Microsoft Microsoft SharePoint Server Subscription Edition

    From 16.0.0 · fixed in 16.0.19725.20434

References 1

msrc.microsoft.com