CVE-2026-69282 in SharePoint Server
Summary
by MITRE • 09/08/2026
Improper access control in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described constitutes a critical failure in the access control mechanisms of Microsoft Office SharePoint, specifically enabling remote code execution by authenticated users. This flaw arises from insufficient validation or authorization checks within the application logic that processes user requests. While the threat actor is required to be an authorized user with valid credentials, the system fails to properly restrict their actions based on their assigned role or permissions level. Consequently, a low-privilege account can manipulate specific inputs or API endpoints in a manner intended only for administrators or higher-level users, thereby bypassing security boundaries designed to isolate different levels of access within the SharePoint environment.
From a technical perspective, this improper access control allows an attacker to inject malicious payloads into processed data streams that are subsequently executed by the server-side components of SharePoint. The operational impact is severe, as successful exploitation grants the attacker full control over the underlying operating system hosting the SharePoint service. This level of compromise enables the exfiltration of sensitive corporate data, modification or deletion of critical content, and potentially serves as a foothold for lateral movement within the internal network to target other systems with higher value assets. The ability to execute code remotely means that physical access is not required, significantly expanding the attack surface and increasing the likelihood of successful exploitation by opportunistic threat actors scanning for known misconfigurations or logic flaws in widely deployed enterprise software.
This vulnerability aligns closely with CWE-269, which defines Improper Privilege Control, where a user possesses privileges that exceed their intended authorization level. Furthermore, it maps to MITRE ATT&CK technique T1078, Valid Accounts, as the attacker leverages legitimate credentials to gain unauthorized access and perform actions outside their designated scope. The exploitation path often involves crafting specific HTTP requests or manipulating session tokens to trigger backend processes without proper administrative verification steps.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Organizations should immediately apply the latest security patches released by Microsoft, which typically include fixes for such logic flaws in access control modules. Additionally, implementing strict role-based access control policies ensures that users are granted only the minimum permissions necessary to perform their job functions, reducing the blast radius if a credential is compromised. Network segmentation can also limit the ability of an attacker who gains initial access via SharePoint to move laterally across the network. Regular auditing of user privileges and monitoring for anomalous administrative actions using security information and event management tools are essential practices to detect potential exploitation attempts early in the kill chain.