CVE-2025-40723 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 footer_text and announcement parameters in config.php.
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Analysis
by VulDB Data Team • 07/03/2025
The stored cross-site scripting vulnerability identified as CVE-2025-40723 affects Flatboard Pro versions prior to 3.2.2 and represents a critical security flaw that allows attackers to inject malicious scripts into the application's footer text and announcement parameters. This vulnerability stems from inadequate input validation mechanisms within the config.php file, where user-provided content is directly stored and subsequently rendered without proper sanitization or encoding. The flaw enables attackers to execute arbitrary JavaScript code in the context of other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions within the application.
This vulnerability manifests as a classic stored XSS attack pattern where malicious input persists in the application's database and is executed whenever legitimate users view the affected pages. The specific parameters affected are footer_text and announcement, which are typically used for customizing the application's display elements. When these parameters contain unvalidated user input, the system fails to properly escape or filter special characters that could be interpreted as HTML or JavaScript code. The vulnerability is particularly dangerous because it allows attackers to establish persistent malicious code execution within the application environment, making it difficult to detect and remediate.
From an operational perspective, this vulnerability poses significant risks to Flatboard Pro installations, as it can be exploited by malicious actors to compromise user sessions and potentially gain unauthorized access to sensitive data. The attack vector requires minimal privileges since the vulnerability exists in the configuration management interface, which is often accessible to authenticated users. The impact extends beyond simple script execution, as successful exploitation could enable attackers to perform actions such as modifying user permissions, accessing confidential information, or redirecting users to malicious websites. This vulnerability directly aligns with CWE-79 which categorizes cross-site scripting flaws, and follows ATT&CK technique T1566.001 for initial access through malicious content.
The recommended mitigation strategy involves immediate upgrading to Flatboard Pro version 3.2.2 or later, which includes proper input validation and sanitization mechanisms for the affected parameters. Additionally, administrators should implement proper output encoding for all user-provided content, particularly in configuration files and display elements. Security measures should include input validation that rejects or sanitizes potentially dangerous characters and patterns, as well as regular security audits of configuration parameters. Organizations should also consider implementing web application firewalls and content security policies to provide additional layers of protection against similar vulnerabilities. The fix should ensure that all user input undergoes proper validation before being stored in the database and that output rendering includes appropriate encoding to prevent script execution in browser contexts.