CVE-2025-53829 in ownCloud
Summary
by MITRE • 07/06/2026
ownCloud is a file storage, synchronization, and sharing application. In ownCloud 10 prior to version 10.15.3, an attacker with administrative privileges can exploit a path traversal vulnerability in the system to execute arbitrary code. Upgrade ownCloud 10 to version 10.15.3 or later to receive a patch.
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Analysis
by VulDB Data Team • 07/06/2026
The vulnerability identified in ownCloud 10 prior to version 10.15.3 represents a critical path traversal flaw that fundamentally compromises the security posture of affected systems. This weakness allows an attacker with administrative privileges to manipulate file system access paths and execute arbitrary code on the underlying server. The vulnerability stems from insufficient input validation within the application's file handling mechanisms, creating an exploitable condition where maliciously crafted file paths can bypass normal access controls. Such a flaw directly violates security principles by enabling unauthorized code execution through legitimate administrative interfaces that should remain protected from malicious manipulation.
The technical exploitation of this path traversal vulnerability occurs when administrative users interact with file system operations that do not properly sanitize user-supplied input. Attackers can craft specific file path sequences that traverse directories beyond the intended boundaries, potentially accessing sensitive system files or executing commands through the application's file handling routines. This type of vulnerability maps directly to CWE-22 Path Traversal and aligns with ATT&CK technique T1059 Command and Scripting Interpreter, as it enables arbitrary code execution through manipulated file operations. The flaw essentially allows attackers to escalate their privileges beyond what administrative access should permit, creating a dangerous escalation path where legitimate administrative functionality becomes a vector for system compromise.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it provides attackers with complete control over the affected ownCloud server infrastructure. Organizations running vulnerable versions face potential data breaches, system compromise, and complete loss of control over their file storage and synchronization services. The attack surface becomes significantly expanded since administrative accounts are typically well-privileged and often have broader access than regular user accounts. This vulnerability essentially transforms legitimate administrative capabilities into weaponized attack vectors that can be leveraged for persistent access, data exfiltration, or further network compromise. Security teams must consider that any system running vulnerable ownCloud versions may have already been compromised if the vulnerability was exploited.
The recommended mitigation strategy involves immediate upgrading to ownCloud 10 version 10.15.3 or later, which incorporates proper input validation and path sanitization measures. This upgrade addresses the root cause by implementing robust checks that prevent malicious path sequences from being processed through the application's file handling mechanisms. Organizations should also conduct thorough security assessments of their existing administrative accounts, implement additional monitoring for unusual file access patterns, and consider network segmentation to limit potential lateral movement if other systems remain vulnerable. The patch resolution specifically targets the CWE-22 Path Traversal weakness through improved input sanitization and proper boundary enforcement within the application's file system operations, ensuring that administrative functions cannot be abused to execute arbitrary code outside of intended operational parameters.