CVE-2026-14951 in FDS
Summary
by MITRE • 08/20/2026
An low privileged remote attacker can cause authenticated users to perform unintended actions in the FDS Web interface using malicious web pages.
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Analysis
by VulDB Data Team • 08/20/2026
The vulnerability described constitutes a Cross-Site Request Forgery (CSRF) flaw within the Fortinet Data Security (FDS) Web management interface. This security weakness allows an unauthenticated or low-privileged remote attacker to trick authenticated administrators into executing unintended actions on behalf of their current session without their knowledge or consent. The core technical mechanism relies on the application's failure to implement adequate anti-CSRF protections, such as unique per-session tokens or strict origin validation for state-changing HTTP requests. By crafting a malicious web page containing hidden forms or automated script-based requests that target specific administrative endpoints, an attacker can induce the victim browser to send authenticated requests with valid session cookies attached automatically by the user agent.
From a technical perspective, this flaw represents a classic violation of the principle of idempotency and proper state management in web applications. When users interact with the FDS Web interface, their browsers maintain active sessions through cookies or other authentication mechanisms. If the server does not verify that incoming requests originate from legitimate pages served by its own domain, it accepts these forged requests as valid administrative commands. This lack of verification enables an attacker to manipulate the state of the application remotely. The attack vector typically involves social engineering tactics where a victim is lured to visit a malicious site or clicks on a crafted link while logged into their FDS console. Once triggered, the browser sends the required HTTP POST or GET requests with all necessary authentication credentials included by default.
The operational impact of this vulnerability can be severe depending on the specific actions an attacker forces the administrator to perform. Potential consequences include unauthorized configuration changes, such as modifying network rules, disabling security features, creating new administrative accounts for persistent access, or exporting sensitive data and logs. In worst-case scenarios, if critical system settings are altered, it could lead to service disruption, exposure of internal network topology, or complete compromise of the managed environment. Since the actions appear to originate from a legitimate administrator session, detection through standard logging may be challenging without specific behavioral analysis tools that monitor for anomalous request patterns originating from external domains.
This vulnerability aligns with CWE-352, which defines Cross-Site Request Forgery as a weakness where an application fails to verify whether the user intended to perform the action in question. Furthermore, it maps directly to MITRE ATT&CK technique T1078, specifically Valid Accounts, and more precisely to sub-techniques involving session hijacking or credential abuse through social engineering. The exploitation does not require breaking encryption or guessing passwords but rather exploits the trust relationship between the browser and the web application.
Mitigation strategies must focus on implementing robust anti-CSRF controls at both the application and infrastructure levels. Developers should enforce unique, unpredictable CSRF tokens that are bound to each user session and validated server-side for every state-changing request. Additionally, setting the SameSite attribute to Strict or Lax on authentication cookies can prevent browsers from sending them in cross-site contexts by default. Implementing strict Content Security Policy headers with appropriate frame-ancestors directives helps mitigate clickjacking vectors often associated with CSRF attacks. For immediate risk reduction, administrators should ensure that sensitive administrative functions require re-authentication via a secondary password prompt or multi-factor authentication before execution. Regular security audits and penetration testing focused on web application logic flaws are essential to identify and remediate such vulnerabilities proactively.