CVE-2025-40722 in Flatboard Pro
Summary
by MITRE • 07/03/2025
Stored Cross-Site Scripting (XSS) vulnerability in versions prior to Flatboard 3.2.2 of Flatboard Pro, consisting of a stored XSS due to lack of proper validation of user input, through the replace parameter in /config.php/tags.
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Analysis
by VulDB Data Team • 07/03/2025
The stored cross-site scripting vulnerability identified as CVE-2025-40722 affects Flatboard Pro versions prior to 3.2.2 and represents a critical security flaw that allows attackers to execute malicious scripts in the context of affected users. This vulnerability specifically resides within the configuration file /config.php/tags and stems from inadequate input validation mechanisms that fail to properly sanitize user-provided data. The flaw enables attackers to inject malicious JavaScript code through the replace parameter, which then gets stored and executed whenever the affected application processes the malicious input. This type of vulnerability falls under CWE-79 which categorizes improper neutralization of input during web page generation, making it a prime target for attackers seeking to compromise user sessions or exfiltrate sensitive information.
The technical exploitation of this vulnerability occurs when an attacker submits malicious content through the replace parameter in the tags configuration file. The application fails to implement proper sanitization or encoding of user input before storing it in the system, creating a persistent XSS vector that can affect all users who view the affected content. The stored nature of this vulnerability means that the malicious payload remains active in the application's database or configuration files, allowing the attack to persist even after the initial injection point is closed. This characteristic significantly increases the attack surface and potential impact compared to reflected XSS vulnerabilities. The vulnerability directly aligns with ATT&CK technique T1531 which describes the use of malicious code to gain access to systems, and specifically targets the web application attack surface through client-side code execution.
The operational impact of CVE-2025-40722 extends beyond simple script execution as it can enable sophisticated attack chains including session hijacking, credential theft, and data exfiltration. An attacker could potentially inject scripts that steal cookies, redirect users to malicious sites, or harvest sensitive information from user interactions with the vulnerable application. The persistent nature of stored XSS makes this vulnerability particularly dangerous in environments where multiple users interact with the same content or configuration parameters. Organizations using Flatboard Pro versions prior to 3.2.2 face significant risk of unauthorized access and data compromise, especially in scenarios where the application handles sensitive user information or serves as a platform for content management. The vulnerability's presence in the core configuration file /config.php/tags indicates a fundamental flaw in the application's data handling architecture that affects the integrity and security of the entire system.
Mitigation strategies for this vulnerability primarily focus on immediate patching and implementation of proper input validation controls. Organizations should upgrade to Flatboard Pro version 3.2.2 or later, which includes the necessary security fixes to address the XSS vulnerability. In addition to patching, implementing comprehensive input sanitization measures is essential, including the use of proper HTML encoding, content security policies, and regular input validation routines. Security measures should also include monitoring for suspicious input patterns and implementing web application firewalls to detect and block malicious payloads. The fix should incorporate proper parameter validation and ensure that all user input is treated as potentially malicious until explicitly validated and sanitized. Organizations should also consider implementing automated security scanning tools to identify similar vulnerabilities in other applications and maintain updated security baselines to prevent future occurrences of such flaws in the software development lifecycle.