CVE-2026-97782 in SharePoint
Summary
by MITRE • 10/15/2026
Observable discrepancy in Microsoft Office SharePoint allows an authorized attacker to perform tampering over a network.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability described involves a critical integrity failure within the Microsoft Office SharePoint environment, specifically manifesting as an observable discrepancy that facilitates unauthorized data manipulation by authenticated users. This flaw represents a significant breach of the confidentiality and integrity principles central to secure information systems, allowing individuals with valid credentials to alter system behavior or stored content in ways not intended by the application logic. The presence of such discrepancies suggests that internal state checks or validation mechanisms are either absent, insufficiently rigorous, or can be bypassed through specific sequence manipulation, enabling an attacker who has already gained access to the network and authenticated into the SharePoint service to execute tampering operations remotely.
From a technical perspective, this issue likely stems from improper input validation or flawed business logic that fails to enforce strict consistency checks on data modifications before they are committed to the database or propagated across the distributed system components of SharePoint. When an authorized user submits requests for updates, inserts, or deletions, the application may not adequately verify whether these actions align with predefined security policies or expected state transitions. This lack of robust server-side validation allows malicious actors to exploit predictable patterns in request handling, potentially manipulating metadata, document properties, or configuration settings without triggering standard error responses that would typically alert administrators to suspicious activity. The observable nature of the discrepancy implies that the system’s feedback mechanisms may inadvertently reveal information about its internal state, aiding further exploitation attempts by confirming successful tampering operations.
The operational impact of this vulnerability is severe, particularly in enterprise environments where SharePoint serves as a central repository for critical business documents and collaborative workflows. An attacker leveraging this flaw can compromise data integrity by altering sensitive files, modifying access control lists to escalate privileges, or injecting malicious content into shared resources that other users subsequently trust and execute. This undermines the reliability of information stored within the platform, potentially leading to financial loss, reputational damage, and regulatory non-compliance if regulated data is tampered with. Furthermore, because the attack requires only authorized access, it poses a significant insider threat risk or represents the successful exploitation of compromised credentials by external adversaries who have moved laterally into the network perimeter.
To mitigate this vulnerability, organizations must prioritize immediate patching according to Microsoft’s security guidance for SharePoint Server and related Office components. Implementing strict role-based access control (RBAC) principles ensures that users operate with only the minimum permissions necessary for their job functions, thereby reducing the attack surface available to potential tampering attempts. Additionally, deploying advanced threat protection solutions capable of monitoring user behavior analytics can help detect anomalous patterns indicative of data manipulation in real time. Regular audits of system logs and configuration settings are essential to identify any existing discrepancies or unauthorized changes that may have occurred prior to remediation. Adhering to industry standards such as the Common Weakness Enumeration (CWE) category for Improper Input Validation, specifically CWE-20, provides a framework for strengthening input handling procedures across all SharePoint integrations and custom solutions.
In alignment with the MITRE ATT&CK framework, this vulnerability facilitates techniques associated with Defense Evasion and Impact categories, particularly those involving data manipulation or defacement by authorized users. Security teams should focus on enhancing monitoring capabilities to detect lateral movement and privilege escalation attempts that often precede such integrity violations. By combining technical patches with rigorous access governance and continuous behavioral monitoring, organizations can effectively neutralize the threat posed by this discrepancy and restore trust in the SharePoint infrastructure’s ability to maintain data fidelity and operational continuity against sophisticated network-based attacks.