CVE-2024-58323 is a stored cross-site scripting vulnerability identified in the Kentico Xperience platform, specifically within the Checkbox form component. The vulnerability arises due to improper neutralization of input during web page generation, allowing attackers to inject malicious JavaScript code that is stored and later executed in the browsers of users who access the affected forms. This occurs because the form builder supports HTML input, and the Checkbox component fails to adequately sanitize or encode user-supplied data before rendering it on web pages. The vulnerability requires low privileges (PR:L) but no authentication (AT:N), and user interaction (UI:P) is necessary to trigger the malicious script execution. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), and limited confidentiality and integrity impact (VC:L, VI:L), with no impact on availability. The scope is limited (S:L), and no known exploits have been reported in the wild as of publication. This vulnerability could be leveraged by attackers to perform session hijacking, steal cookies, deface websites, or conduct phishing attacks by injecting malicious scripts that run in the context of trusted users. Since Kentico Xperience is widely used for content management and web experience delivery, the vulnerability poses a risk to organizations relying on this platform for customer-facing and internal web applications.

For European organizations, the impact of CVE-2024-58323 can be significant, especially for those using Kentico Xperience to manage public-facing websites or internal portals. Exploitation could lead to unauthorized access to user sessions, theft of sensitive information such as authentication tokens, and potential defacement or manipulation of web content. This can damage organizational reputation, lead to regulatory compliance issues under GDPR due to data breaches, and disrupt business operations. The medium severity rating reflects that while the vulnerability does not directly compromise system availability or critical infrastructure, the confidentiality and integrity of user data and web content are at risk. Organizations in sectors such as finance, healthcare, government, and e-commerce, which often use Kentico for digital experience management, may face increased risk of targeted attacks leveraging this vulnerability.

To mitigate CVE-2024-58323, organizations should prioritize the following actions: 1) Apply official patches or updates from Kentico as soon as they are released to address the vulnerability in the Checkbox form component. 2) Review and sanitize all user inputs in custom form components, ensuring proper encoding and validation to prevent injection of malicious scripts. 3) Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4) Conduct regular security audits and penetration testing focused on web application components, particularly those handling user-generated content. 5) Educate developers and administrators about secure coding practices related to input handling and output encoding. 6) Monitor web application logs and user activity for signs of suspicious behavior indicative of exploitation attempts. 7) Consider deploying web application firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting Kentico Xperience forms.