CVE-2026-24576 in UX Flat Plugin
Summary
by MITRE • 01/23/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in COP UX Flat ux-flat allows Stored XSS.This issue affects UX Flat: from n/a through <= 5.4.0.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 01/23/2026
The vulnerability identified as CVE-2026-24576 represents a critical cross-site scripting flaw within the COP UX Flat ux-flat web application framework. This weakness specifically manifests as improper neutralization of input during web page generation, creating an environment where malicious scripts can be persistently stored and subsequently executed against unsuspecting users. The vulnerability exists within the ux-flat component and affects versions ranging from the initial release through version 5.4.0, indicating a prolonged period during which this security gap remained unaddressed. The stored nature of this XSS vulnerability means that malicious input is not only reflected in the current page but is permanently saved within the application's database or storage mechanisms, making it particularly dangerous as it can affect multiple users over extended periods.
This vulnerability directly maps to CWE-79 which defines Cross-Site Scripting as a weakness where untrusted data is embedded into web pages without proper validation or escaping mechanisms. The flaw operates at the application layer where user input intended for display in web interfaces is not adequately sanitized before being rendered back to users. The impact extends beyond simple script execution as it can enable attackers to steal session cookies, perform unauthorized actions on behalf of users, manipulate application data, or redirect users to malicious websites. The stored aspect of this vulnerability means that attackers can inject malicious payloads that persist across multiple user sessions, unlike reflected XSS which requires user interaction with a specific malicious link.
The operational impact of this vulnerability is severe for any organization utilizing the affected ux-flat framework, as it provides attackers with persistent access to user sessions and potentially administrative privileges if the application lacks proper input validation controls. Attackers can leverage this weakness to establish long-term footholds within the application environment, monitor user activities, and extract sensitive information from authenticated sessions. The vulnerability affects the fundamental security posture of web applications built on this framework, potentially compromising user privacy and data integrity. Organizations using affected versions face significant risk of data breaches, session hijacking, and unauthorized access to sensitive application functionality, particularly when the framework handles user-generated content or administrative interfaces.
Mitigation strategies for CVE-2026-24576 should prioritize immediate version upgrades to the latest stable release of the ux-flat framework where the XSS vulnerability has been addressed. Organizations must implement comprehensive input validation and output encoding mechanisms throughout their applications to prevent malicious data from being stored or executed. The implementation of Content Security Policy headers can provide additional protection layers against script execution, while regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities. Security teams should also establish proper logging and monitoring of user input to detect anomalous activity patterns that may indicate exploitation attempts. The remediation process should include thorough code reviews focusing on all input handling mechanisms, particularly those involving user-generated content, and adherence to secure coding practices that prevent the introduction of similar vulnerabilities in future development cycles. Organizations should consider implementing web application firewalls and additional runtime protections to detect and block malicious payloads even if the underlying vulnerability remains unpatched temporarily.