Description

Incorrect authorization in Microsoft Office SharePoint allows an authorized attacker to perform tampering over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-11T17:18:45.950Z",
  "pubdate": "2026-08-11T17:18:45.950Z",
  "executiveSummary": "This vulnerability involves an incorrect authorization flaw within Microsoft Office SharePoint, which exposes the application to data tampering exploits.\nAn authenticated attacker with network access can leverage this security deficit to manipulate, modify, or corrupt data within the affected system without proper privilege validation.\nThe primary impact of this flaw is the compromise of data integrity within Microsoft Office SharePoint environments, potentially leading to unauthorized alterations of sensitive documents and enterprise resources.\nExploitation requires the attacker to have initial network connectivity to the target SharePoint instance and valid authentication credentials to interact with the vulnerable component.\nThe root cause stems from improper access control enforcement, allowing authorized users to bypass permission boundaries and execute unauthorized write or modification operations.\nOrganizations utilizing Microsoft Office SharePoint face risks associated with malicious data alteration, insider threats, and potential compliance violations due to compromised information trustworthiness.",
  "technicalDetails": "The vulnerability resides in the authorization logic of Microsoft Office SharePoint, specifically within the access control subsystems responsible for validating user permissions against requested actions on enterprise resources.\nThe root cause is attributable to improper authorization checks, where the application fails to adequately verify whether a standard authenticated user possesses the explicit rights required to perform specific data modification routines.\nNetwork exposure is a prerequisite, as the attack vector requires the adversary to interact with the service over the network using standard application protocols.\nAuthentication is required; however, the flaw allows low-privilege or standard authorized users to escalate their functional capabilities regarding data modification beyond their assigned access control lists (ACLs).\nThe step-by-step attack flow begins with the malicious actor establishing a standard authenticated session with the Microsoft Office SharePoint server.\nNext, the attacker crafts a specialized request targeting vulnerable functions or endpoints within the SharePoint architecture that handle data updates, object creation, or document modification.\nBecause the underlying codebase fails to enforce strict privilege checks or adequately validate the scope of the user session against the target resource, the application processes the request.\nThe payload behavior involves executing unauthorized write, update, or delete commands against protected repositories, bypassing the intended security boundaries.\nThe post-exploitation impact includes unauthorized data tampering, persistent modification of critical business files, potential introduction of malicious content into shared workflows, and degradation of overall system data integrity."
}