CVE-2024-32987 in SharePoint Server
Summary
by MITRE • 07/09/2024
Microsoft SharePoint Server Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 06/23/2026
Microsoft SharePoint Server contains an information disclosure vulnerability that arises from improper access controls within the web application framework. This flaw allows authenticated attackers with limited privileges to access sensitive data and system information that should be restricted to authorized personnel only. The vulnerability stems from insufficient validation of user permissions when processing certain API requests and web service calls within the SharePoint infrastructure. Attackers can exploit this weakness by crafting specific HTTP requests that bypass normal authorization checks, potentially gaining access to confidential documents, user credentials, system configurations, and internal network details. The issue primarily affects SharePoint Server 2016, 2019, and Microsoft 365 environments where the affected components are deployed.
The technical root cause of this vulnerability lies in the improper implementation of access control mechanisms within SharePoint's authentication and authorization framework. When processing certain web requests, the system fails to adequately verify that the requesting user possesses sufficient privileges to access the requested resources. This weakness manifests particularly when dealing with SharePoint's REST API endpoints and legacy web service interfaces. The flaw can be categorized under CWE-284 which specifically addresses improper access control vulnerabilities in software systems. Attackers typically exploit this by leveraging existing valid credentials to make crafted requests that traverse the normal permission boundaries, effectively elevating their access level without requiring additional authentication factors.
The operational impact of this information disclosure vulnerability extends beyond simple data exposure to potentially enable more sophisticated attack vectors within the SharePoint environment. Successful exploitation can lead to unauthorized access to sensitive corporate documents, user account information, and internal system configurations that may reveal network topology details or administrative credentials. This type of vulnerability aligns with ATT&CK technique T1087 which covers account discovery activities, as attackers can use the leaked information to map out user permissions and identify potential targets for further exploitation. The vulnerability also supports lateral movement techniques by providing attackers with insights into system architecture that could be leveraged for privilege escalation or additional compromise of connected systems.
Organizations should implement multiple layers of defense to mitigate this information disclosure vulnerability effectively. Immediate remediation efforts should focus on applying the latest security patches and updates released by Microsoft through their regular security bulletins. Network segmentation and firewall rules should be implemented to restrict access to SharePoint servers from untrusted networks, limiting potential attack surfaces. Access control policies must be reviewed and strengthened to ensure proper least privilege principles are enforced throughout the SharePoint environment. Security monitoring solutions should be configured to detect anomalous access patterns or unusual API request behaviors that may indicate exploitation attempts. Additionally, regular security assessments including penetration testing and vulnerability scanning should be conducted to identify and remediate similar access control weaknesses within the broader enterprise infrastructure.