CVE-2016-20051 in Snews CMS
Summary
by MITRE • 04/04/2026
Snews CMS 1.7 contains a cross-site request forgery vulnerability that allows attackers to change administrator credentials without authentication by crafting malicious HTML forms. Attackers can trick authenticated administrators into visiting a page containing a hidden form that submits POST requests to the changeup action, modifying the admin username and password parameters to gain unauthorized access.
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Analysis
by VulDB Data Team • 07/21/2026
The vulnerability identified as CVE-2016-20051 represents a critical cross-site request forgery flaw within the Snews CMS version 1.7 implementation. This weakness resides in the authentication and privilege escalation mechanisms of the content management system, specifically targeting the administrative account modification functionality. The flaw allows unauthorized threat actors to manipulate the system's administrative credentials through the exploitation of a maliciously crafted HTML form that leverages the browser's inherent trust in authenticated sessions.
The technical exploitation of this CSRF vulnerability occurs through the manipulation of the changeup action endpoint within the CMS framework. When an authenticated administrator visits a malicious webpage containing a hidden HTML form, the form automatically submits POST requests to the vulnerable endpoint without the user's knowledge or explicit consent. The malicious payload specifically targets the admin username and password parameters, enabling attackers to completely compromise administrative access. This technique relies on the browser's automatic handling of cookies and session management, which maintains the authenticated state of the administrator session, making the attack particularly effective.
The operational impact of this vulnerability extends beyond simple credential theft, as it provides attackers with complete administrative control over the compromised CMS instance. Once successful, the attacker gains unrestricted access to all content management functions, including the ability to modify website content, add or remove users, install malicious plugins, and potentially use the compromised system as a launching point for further attacks within the network. The vulnerability's exploitation does not require any special privileges or advanced technical knowledge, making it particularly dangerous in environments where administrators frequently browse untrusted websites or receive phishing emails.
Security practitioners should recognize this vulnerability as a direct violation of the principle of least privilege and proper input validation practices. The flaw demonstrates a critical failure in the CMS's implementation of anti-CSRF token mechanisms, which should have been employed to validate the authenticity of requests originating from the legitimate administrative interface. According to CWE guidelines, this represents a classic example of CWE-352, Cross-Site Request Forgery, where the application fails to validate that requests originate from the legitimate source. The vulnerability also aligns with ATT&CK technique T1078.004, Valid Accounts, as it enables attackers to assume administrative privileges without requiring additional credential compromise.
Organizations affected by this vulnerability should immediately implement multiple layers of mitigation strategies. The primary remediation involves updating to the latest version of Snews CMS where the CSRF protection mechanisms have been properly implemented. Additionally, administrators should consider implementing Content Security Policy headers to prevent unauthorized form submissions, and deploy web application firewalls to detect and block suspicious request patterns. Network segmentation and monitoring should be enhanced to detect unusual administrative activities, while regular security assessments should be conducted to identify similar vulnerabilities in other applications within the organization's attack surface.