CVE-2024-37488 in HelloAsso Plugin
Summary
by MITRE • 07/21/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in HelloAsso HelloAsso helloasso.This issue affects HelloAsso: from n/a through <= 1.1.9.
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Analysis
by VulDB Data Team • 04/02/2026
The vulnerability identified as CVE-2024-37488 represents a critical cross-site scripting flaw that manifests during web page generation within the HelloAsso platform. This weakness falls under the category of improper input neutralization, where user-supplied data fails to be adequately sanitized before being incorporated into web content. The vulnerability specifically impacts versions of HelloAsso ranging from the initial release through version 1.1.9, indicating a prolonged exposure window that could have allowed attackers to exploit this flaw for extended periods.
The technical implementation of this XSS vulnerability stems from insufficient validation and sanitization of input parameters that are subsequently rendered in web pages without proper escaping or encoding mechanisms. When user input containing malicious script code is processed and displayed in the application's interface, the browser executes this code within the context of the authenticated user's session. This flaw enables attackers to inject malicious payloads that can manipulate web page content, steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious domains.
From an operational perspective, this vulnerability creates significant risk for organizations using HelloAsso platforms as it allows attackers to establish persistent malicious presence within the application environment. The impact extends beyond simple data theft to include potential account takeovers, data manipulation, and service disruption. Attackers could leverage this vulnerability to inject phishing content, execute malicious scripts against unsuspecting users, or establish backdoor access points within the platform. The nature of this flaw means that any user input field within the HelloAsso application could serve as an attack vector, making the scope of potential exploitation quite broad.
The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting issues in web applications, and maps to ATT&CK technique T1059.001 for command and scripting interpreter. Organizations should immediately implement input validation and output encoding mechanisms to prevent user-supplied data from being executed as code. The recommended mitigations include implementing proper HTML escaping for all dynamic content, utilizing Content Security Policy headers, and conducting thorough input validation at multiple layers of the application architecture. Additionally, regular security assessments and code reviews should be implemented to identify similar vulnerabilities in other components of the platform.
Security teams should prioritize patching affected versions of HelloAsso to address this vulnerability, as the lack of version information in the CVE description suggests a potential gap in the vendor's vulnerability disclosure practices. The remediation process should involve comprehensive testing to ensure that the applied fixes do not introduce regressions in application functionality while maintaining the security posture against similar XSS threats. Organizations relying on HelloAsso services must also implement monitoring for suspicious activities and user behavior that could indicate exploitation attempts.