Description

Improper authentication in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-11T17:18:36.787Z",
  "pubdate": "2026-08-11T17:18:36.787Z",
  "executiveSummary": "A vulnerability categorized as improper authentication exists within Microsoft Office SharePoint, potentially allowing an authorized threat actor to execute a privilege escalation attack over a network.\nThe flaw impacts Microsoft Office SharePoint systems, presenting significant risk implications to enterprise environments by granting unauthorized access tiers beyond the user's intended authorization boundary.\nThe attacker capabilities require prior network access and valid authorization credentials within the system to initiate the attack vector.\nSuccessful exploitation compromises the integrity and confidentiality of the affected SharePoint deployment, enabling unauthorized actors to inherit elevated security privileges and administrative capabilities across the network architecture.",
  "technicalDetails": "The root cause of the vulnerability stems from improper authentication handling within the Microsoft Office SharePoint component responsible for processing security contexts and session validation.\nDue to insufficient verification of authorization tokens or cryptographic validation flaws during state transitions, the system fails to adequately enforce access control lists and permission boundaries.\nThe vulnerable component resides within the core authentication and privilege management subsystems of Microsoft Office SharePoint.\nExploitation requires network exposure, where an authorized user with low-level privileges interacts maliciously or crafts specific requests targeting the flawed authentication logic.\nThe attack flow proceeds as follows: First, the authenticated attacker establishes a network connection with the target Microsoft Office SharePoint instance. Second, the attacker submits a specially crafted request designed to exploit the improper authentication mechanism. Third, the flawed component improperly validates the privilege level associated with the session context, erroneously granting higher-tier administrative or functional rights to the requestor.\nPost-exploitation impact includes the elevation of privileges, enabling the attacker to execute administrative functions, access restricted data repositories, modify sensitive configurations, and potentially pivot to underlying host infrastructure depending on the scope of the elevated permissions acquired."
}