CVE-2026-7176 in Entradium Plugin
Summary
by MITRE • 10/01/2026
CVE-2026-7176: the Help text and Title parameters in the endpoint /events/<event_name>-<event_city>/custom_form/edit during the process of creating or modifying forms associated with ticket sales for an event, which allows for the injection of JavaScript that will execute on the public ticket purchase page for the event.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified as CVE-2026-7176 represents a critical stored cross-site scripting flaw within the administrative interface of a web-based application used for managing event ticketing and form customization. This specific weakness resides in two distinct input fields, namely Help text and Title, which are processed by the endpoint /events/<event_name>-<event_city>/custom_form/edit during the creation or modification of custom forms associated with public ticket sales events. The core technical failure lies in the application's insufficient sanitization and validation of user-supplied data before it is persisted to the backend database and subsequently rendered on client-side pages without proper encoding. When an attacker injects malicious JavaScript payloads into these fields, the server accepts the input as valid content rather than recognizing it as executable code. This lack of output encoding ensures that when other users access the public ticket purchase page for the affected event, their browsers interpret the injected script as legitimate part of the webpage's DOM structure and execute it immediately within the context of the application's domain.
From a technical perspective, this vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation known as cross-site scripting. The attack vector is particularly dangerous because it involves stored persistence rather than reflected injection. In a typical scenario, an administrator or user with permission to edit event forms would inadvertently become the initial attacker by injecting the payload through the administrative interface. Once saved, this malicious code becomes part of the static content served to every visitor who accesses that specific event's ticketing page. This mechanism bypasses many client-side security controls and browser-based filters because the script originates from a trusted domain, allowing it to operate with full privileges granted by the user's session cookie or authentication token. The presence of such scripts enables attackers to perform actions on behalf of legitimate users without their knowledge or consent, effectively hijacking active sessions and manipulating the application state dynamically in real-time.
The operational impact of this vulnerability is severe due to its direct exposure to end-users during a high-value transactional process. Since the malicious script executes on the public ticket purchase page, it can target customers who are actively entering sensitive personal information such as credit card numbers, billing addresses, and identity verification details. Attackers can utilize techniques like keylogging or form field manipulation to steal this financial data in transit before it is encrypted by HTTPS for transmission to the server. Furthermore, the vulnerability allows for session hijacking where the attacker extracts the user's authentication cookies via document.cookie access, potentially leading to full account takeover if those sessions are not properly secured with HttpOnly flags. Beyond direct theft, the script can be used to deface the public-facing interface, redirect users to phishing sites mimicking the legitimate ticketing platform, or even launch further attacks against other systems accessible from the victim's network environment through browser-based exploits that leverage additional vulnerabilities in the user's local machine or connected services.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The most urgent action is to implement strict input validation on the server side for all fields within the custom form editing endpoint, ensuring that only expected alphanumeric characters, standard punctuation, and safe HTML entities are permitted while rejecting any script tags or event handlers like onload or onclick. Simultaneously, output encoding must be enforced rigorously when rendering these values in the browser context to ensure they are treated as plain text rather than executable code. Developers should adopt a whitelist approach for allowed content types and utilize modern web frameworks that automatically escape data by default during template rendering. Additionally, implementing Content Security Policy headers can provide an additional layer of defense by restricting the sources from which scripts can be loaded or executed, thereby neutralizing many injected payloads even if they bypass input filters. Regular security audits focusing on secure coding practices for user-generated content and automated static analysis tools integrated into the CI/CD pipeline are essential to prevent similar injection flaws in future releases.