CVE-2025-53830 in ownCloud
Summary
by MITRE • 07/06/2026
Anti-Virus for ownCloud is an anti-virus application for file storage, synchronization, and sharing application ownCloud. Versions of Anti-Virus for ownCloud before 1.2.3 are vulnerable to Server-Side Request Forgery (SSRF). This corresponds to versions of ownCloud 10 prior to 10.15.3. Upgrade ownCloud 10 to version 10.15.3 or later or upgrade Anti-Virus for ownCloud 10 to version 1.2.3 or later to receive a fix.
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Analysis
by VulDB Data Team • 07/06/2026
The vulnerability in question affects the anti-virus integration component of ownCloud, a widely deployed file storage and synchronization platform that serves as a cornerstone for enterprise file sharing solutions. This particular flaw manifests as a server-side request forgery vulnerability that allows malicious actors to manipulate the application's behavior by forcing it to make unauthorized requests to internal or external systems. The issue specifically impacts versions of the anti-virus plugin prior to 1.2.3, which are inherently tied to ownCloud versions before 10.15.3, creating a cascading dependency that affects organizations relying on these outdated configurations.
The technical implementation of this vulnerability stems from inadequate input validation within the anti-virus plugin's request handling mechanism. When the system processes file scanning requests, it fails to properly validate or sanitize user-supplied URLs or endpoints that are used to communicate with external antivirus services. This weakness enables attackers to craft malicious requests that can bypass normal network restrictions and potentially access internal resources that should remain isolated from external networks. The flaw operates at the application layer where the system trusts user-provided data without sufficient verification, creating a pathway for unauthorized communication.
The operational impact of this vulnerability extends beyond simple data exposure, as it fundamentally compromises the integrity and security boundaries of organizations using affected versions of ownCloud. Attackers can leverage this SSRF vulnerability to perform reconnaissance activities by scanning internal network ranges that would normally be protected from external access. This capability allows threat actors to map internal infrastructure, identify sensitive systems, and potentially escalate their attack surface. The vulnerability also enables the execution of arbitrary code or data exfiltration through manipulated request parameters, creating significant risk for organizations handling sensitive corporate or personal data.
Organizations must prioritize immediate remediation by upgrading to ownCloud version 10.15.3 or later, alongside updating the anti-virus plugin to version 1.2.3 or newer. This dual upgrade approach addresses both the core platform vulnerability and the specific plugin weakness that enables the SSRF attack vector. Security teams should also implement network segmentation controls and monitor for unusual outbound traffic patterns that might indicate exploitation attempts. The fix implemented in these updated versions typically includes enhanced input validation, proper URL sanitization, and restricted communication pathways that prevent unauthorized access to internal systems.
This vulnerability aligns with CWE-918, which specifically addresses server-side request forgery flaws in web applications, and demonstrates how third-party integrations can introduce critical security weaknesses into enterprise platforms. From an ATT&CK framework perspective, this vulnerability maps to technique T1190 for exploiting vulnerabilities in web applications and could enable subsequent techniques such as T1071 for application layer protocol usage and T1566 for social engineering. The remediation process should also include comprehensive security assessments of all integrated third-party applications to identify similar vulnerabilities that might exist within the broader ecosystem.