CVE-2026-14856 in TastyIgniter
Summary
by MITRE • 07/27/2026
A stored Cross-Site Scripting (XSS) vulnerability in the file upload functionality of the Media Manager in TastyIgniter v4.3.0, caused by insufficient validation and sanitization of SVG files. An authenticated user with low privileges can upload a malicious SVG file containing JavaScript code. When an administrator views that file, the code executes in the context of their browser. By chaining this vulnerability with a Cross-Site Request Forgery (CSRF) attack, an attacker can extract the administrator’s CSRF token and perform unauthorized actions—such as modifying credentials—thereby gaining full control of the administrative account.
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Analysis
by VulDB Data Team • 07/27/2026
The vulnerability under discussion represents a critical stored cross-site scripting flaw within the Media Manager component of TastyIgniter version 4.3.0, specifically targeting the file upload functionality. This issue stems from inadequate input validation and sanitization processes applied to Scalable Vector Graphics files, which are commonly used for images but can contain executable code when improperly handled. The flaw allows an authenticated user with minimal privileges to upload a malicious SVG file that contains embedded javascript code, creating a persistent threat vector that remains active until the file is removed from the system.
The technical exploitation of this vulnerability occurs through a sophisticated attack chain that leverages both the stored XSS capability and CSRF weaknesses within the application architecture. When an administrator subsequently views the compromised SVG file within the Media Manager interface, the embedded javascript code executes within the administrator's browser context, effectively enabling the attacker to impersonate the administrator. This stored nature of the vulnerability means that the malicious payload persists indefinitely until manually removed, providing attackers with sustained access to execute commands and manipulate system resources.
The operational impact of this vulnerability extends far beyond simple script execution, as it creates a complete administrative takeover scenario when combined with CSRF attack vectors. The attacker can leverage the XSS payload to extract the administrator's CSRF token through browser-based techniques, which then enables them to perform unauthorized actions within the application. This includes modifying user credentials, accessing sensitive data, and potentially executing arbitrary commands that would normally be restricted to privileged users. The combination of these vulnerabilities creates a particularly dangerous threat model where low-privilege attackers can achieve high-level system compromise.
Security practitioners should consider this vulnerability in the context of CWE-79 which specifically addresses cross-site scripting flaws, and ATT&CK technique T1566.001 which covers credential access through phishing attacks. The remediation strategy must include comprehensive input validation for all file types, particularly SVG files, through strict sanitization processes that remove or neutralize executable content. Organizations should implement Content Security Policy headers to prevent execution of unauthorized scripts, enforce proper file type checking, and ensure that uploaded files are scanned for malicious content before being made accessible to other users. Additionally, implementing CSRF protection mechanisms with unique tokens per session and validating all administrative actions through multi-factor authentication can significantly reduce the risk of exploitation.
The vulnerability demonstrates the critical importance of validating and sanitizing all user-supplied input, particularly when dealing with file uploads that may contain complex file formats like SVG. The attack surface expands considerably when multiple vulnerabilities exist in combination, as seen here where the stored XSS creates a persistent threat that can be leveraged to extract CSRF tokens and perform unauthorized administrative actions. This particular flaw highlights the need for comprehensive security testing of all application components, especially those handling user uploads and administrative functions. Organizations must also maintain up-to-date security practices including regular vulnerability assessments, proper input validation, and robust access controls to prevent such cascading security failures from occurring in production environments.