CVE-2025-53828 in SharePoint for ownCloud
Summary
by MITRE • 07/06/2026
SharePoint for ownCloud is an application for using SharePoint with the file storage, synchronization, and sharing application ownCloud Classic. In SharePoint for ownCloud prior to version 0.4.1, which corresponds to ownCloud 10 prior to 10.15.3, an attacker with administrative privileges can use a SSRF vulnerability in the SharePoint app to execute arbitrary code on the system. Upgrade ownCloud 10 to version 10.15.3 or later to receive SharePoint for ownCloud 0.4.1, the fixed version.
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Analysis
by VulDB Data Team • 07/06/2026
This vulnerability exists within the SharePoint for ownCloud application, which serves as a bridge between Microsoft SharePoint and the ownCloud Classic file storage platform. The issue stems from a server-side request forgery flaw that allows malicious actors with administrative access to manipulate the application's internal processes. The vulnerability specifically affects versions prior to 0.4.1 of the SharePoint app, which corresponds to ownCloud 10 versions before 10.15.3, creating a critical security gap in environments where administrative privileges are compromised.
The technical implementation of this SSRF vulnerability enables an attacker with administrative credentials to craft malicious requests that can bypass normal access controls and execute arbitrary code on the underlying system. This occurs because the application fails to properly validate and sanitize external input parameters that are used to construct internal HTTP requests, allowing attackers to redirect these requests to internal services or resources that should otherwise be inaccessible. The flaw resides in the application's handling of remote resource references, where user-supplied data is directly incorporated into HTTP request construction without adequate sanitization measures.
The operational impact of this vulnerability is severe as it provides a complete compromise path for attackers who have already gained administrative access to the ownCloud system. Once exploited, the SSRF vulnerability allows for arbitrary code execution which can lead to full system compromise, data exfiltration, and persistence mechanisms. Attackers could potentially escalate their privileges further by accessing internal services that are normally restricted, such as database connections, other internal applications, or system management interfaces. This creates a significant risk for organizations relying on SharePoint for ownCloud integration without proper patching.
The recommended mitigation strategy involves upgrading the entire ownCloud 10 installation to version 10.15.3 or later, which includes the fixed SharePoint for ownCloud application version 0.4.1. This upgrade addresses the underlying SSRF vulnerability through improved input validation and request handling mechanisms that prevent malicious redirection of internal requests. Organizations should also consider implementing additional network segmentation and access controls to limit the potential impact of administrative credential compromise. The fix aligns with common security practices for preventing SSRF attacks as outlined in CWE-918 and follows the mitigation strategies recommended by the ATT&CK framework for privilege escalation techniques.
This vulnerability classification places it within the context of CWE-918 Server-Side Request Forgery, which specifically addresses the risk of attackers manipulating servers into making unintended requests to internal systems. The security implications extend beyond simple code execution as they represent a fundamental breakdown in the application's trust boundaries and input validation mechanisms. Organizations should conduct thorough vulnerability assessments to identify any systems running affected versions and implement proper monitoring for suspicious network activity that might indicate exploitation attempts.
The broader security landscape for file synchronization platforms demonstrates how integration applications can introduce unexpected attack vectors, particularly when administrative privileges are involved. This vulnerability serves as a reminder of the importance of comprehensive security testing for integrated applications and the necessity of maintaining up-to-date software versions to protect against known vulnerabilities in third-party components. The remediation process should include verification that the upgrade has properly addressed all aspects of the SSRF vulnerability and that no additional configuration changes are required to maintain system integrity.