CVE-2024-37764 identifies an authenticated stored cross-site scripting (XSS) vulnerability in MachForm, a popular web-based form builder, affecting versions up to 19. Stored XSS occurs when malicious input is saved by the application and later rendered in users' browsers without proper sanitization, allowing attackers to execute arbitrary JavaScript code. This vulnerability requires the attacker to have legitimate user credentials (low privilege) and involves user interaction to trigger the malicious payload, which limits its exploitation scope. The CVSS v3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) indicates network attack vector, low attack complexity, privileges required, user interaction needed, scope changed, and low impact on confidentiality and integrity, with no impact on availability. The scope change means the vulnerability can affect resources beyond the initially compromised component. Although no public exploits or patches are currently available, the vulnerability poses a risk of session hijacking, data theft, or unauthorized actions performed on behalf of other users. Being a stored XSS, the malicious script persists in the application, increasing the risk of exposure to multiple users. The vulnerability is categorized under CWE-79, highlighting improper input neutralization leading to script injection. MachForm is widely used globally for form management, making this vulnerability relevant to many organizations relying on it for data collection and workflow automation.

The primary impact of CVE-2024-37764 is the potential compromise of user confidentiality and integrity within affected MachForm deployments. Attackers with valid credentials can inject malicious scripts that execute in other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed with the victim's privileges. Although availability is not affected, the breach of confidentiality and integrity can lead to data leakage, reputational damage, and compliance violations. Since the vulnerability requires authentication and user interaction, the attack surface is limited to internal or trusted users, but insider threats or compromised accounts increase risk. Organizations using MachForm for sensitive data collection or workflow automation may face significant operational and security risks if exploited. The lack of patches and public exploits means organizations must act proactively to reduce exposure. The scope change in the CVSS vector suggests that the impact can extend beyond the initially compromised component, potentially affecting other parts of the application or integrated systems.

1. Restrict user privileges: Limit the ability to submit or edit form content to trusted users only, reducing the risk of malicious input. 2. Implement strict input validation and output encoding: Apply server-side validation to sanitize all user inputs and encode outputs to prevent script injection. 3. Employ Content Security Policy (CSP): Configure CSP headers to restrict the execution of unauthorized scripts in browsers. 4. Monitor logs and user activity: Detect unusual behavior or repeated failed attempts that may indicate exploitation attempts. 5. Educate users: Train users to recognize suspicious links or behaviors that may trigger XSS payloads. 6. Isolate sensitive functions: Separate critical workflows from user-generated content to minimize impact. 7. Prepare for patching: Stay alert for official patches or updates from MachForm and apply them promptly once available. 8. Consider web application firewalls (WAF): Deploy WAF rules to detect and block XSS payloads targeting MachForm. 9. Conduct regular security assessments: Perform penetration testing focusing on XSS vectors within MachForm environments. These measures combined can significantly reduce the risk until an official patch is released.