Microsoft SharePoint, Privilege Escalation, CVE-2025-29976 (Critical)

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How the CVE Works

CVE-2025-29976 is an improper privilege management vulnerability in Microsoft Office SharePoint. An authenticated attacker can exploit this flaw to elevate privileges locally by manipulating access control mechanisms. The vulnerability arises due to insufficient validation of user permissions when executing certain administrative functions. By crafting malicious requests, an attacker can bypass intended restrictions, gaining unauthorized elevated rights within the SharePoint environment. This could lead to unauthorized data access, configuration changes, or full system compromise.

DailyCVE Form

Platform: Microsoft SharePoint
Version: Unspecified (pre-patch)
Vulnerability: Privilege Escalation
Severity: Critical
Date: 06/23/2025

Prediction: Expected Patch Date: 07/15/2025

What Undercode Say

Analytics:

Get-SPUser -Identity "Attacker" | Check-SPPermission -Scope "SiteCollection"

POST /_api/web/ensureuser HTTP/1.1
Host: target-sharepoint
Authorization: Bearer [bash]

How Exploit:

1. Authenticate with low-privilege credentials.

2. Craft malicious API request to modify permissions.

3. Execute privilege escalation payload.

Protection from this CVE:

  • Apply Microsoft’s pending patch.
  • Restrict SharePoint administrative access.
  • Monitor suspicious permission changes.

Impact:

  • Unauthorized data access.
  • Full SharePoint compromise.
  • Lateral movement within network.

Sources:

Reported By: nvd.nist.gov
Extra Source Hub:
Undercode

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