CVE-2020-8960 in mycloud.com
Summary
by MITRE
Western Digital mycloud.com before Web Version 2.2.0-134 allows XSS.
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Analysis
by VulDB Data Team • 05/11/2025
The vulnerability identified as CVE-2020-8960 represents a cross-site scripting flaw within Western Digital mycloud.com web interface prior to version 2.2.0-134. This issue resides in the web application's handling of user input and output encoding mechanisms, creating an avenue for malicious actors to inject arbitrary JavaScript code into the application's response. The vulnerability affects the web version of the Western Digital My Cloud storage solution, which provides cloud-based storage services and management capabilities for users. The flaw specifically manifests when the application fails to properly sanitize or encode user-supplied data before rendering it within the web interface, allowing attackers to execute scripts in the context of other users' browsers. This represents a critical security weakness that can be exploited to compromise user sessions, steal sensitive information, or perform unauthorized actions on behalf of affected users.
The technical nature of this vulnerability aligns with CWE-79, which describes Cross-Site Scripting flaws where untrusted data is incorporated into web pages without proper validation or encoding. The flaw occurs in the web application layer where user input is processed and displayed, creating an environment where malicious scripts can be injected through various vectors including form fields, URL parameters, or other user-controllable input points. Attackers can leverage this vulnerability by crafting malicious payloads that, when executed in a victim's browser, can steal session cookies, redirect users to malicious sites, or manipulate the application interface. The vulnerability demonstrates a failure in the application's security controls to properly implement input validation and output encoding practices that are fundamental to preventing XSS attacks.
The operational impact of CVE-2020-8960 extends beyond simple script execution, as it enables attackers to potentially escalate privileges and access sensitive user data stored within the My Cloud environment. Users who authenticate to the web interface may have their session tokens stolen, leading to unauthorized access to their cloud storage accounts. The vulnerability also creates opportunities for attackers to perform persistent attacks against multiple users within the same environment, as the malicious scripts can remain active until the browser session expires or the page is refreshed. This type of vulnerability can be particularly dangerous in enterprise environments where users may store confidential business data or personal information within the cloud storage system. The impact is further amplified by the fact that the vulnerability affects a widely used cloud storage solution, potentially exposing thousands of users to coordinated attacks.
Mitigation strategies for CVE-2020-8960 should prioritize immediate patching of affected systems to version 2.2.0-134 or later, as this represents the official fix provided by Western Digital. Organizations should also implement additional protective measures including input validation at multiple layers, proper output encoding of all user-supplied data, and the implementation of Content Security Policy headers to limit script execution. Network monitoring should be enhanced to detect suspicious traffic patterns that may indicate exploitation attempts, and users should be educated about the risks of clicking on untrusted links or visiting compromised websites. The vulnerability also highlights the importance of following secure coding practices and conducting regular security assessments of web applications, particularly those handling sensitive user data. Organizations should consider implementing web application firewalls and additional security controls to protect against similar vulnerabilities in their broader network infrastructure, as this type of flaw can serve as a stepping stone for more sophisticated attacks within the attack chain defined by the MITRE ATT&CK framework.