CVE-2024-58318 is a stored cross-site scripting vulnerability identified in Kentico Xperience, a popular web content management system. The vulnerability arises from improper neutralization of input during web page generation, specifically within the rich text editor component used in page and form builders. Attackers can exploit this flaw by injecting malicious scripts through crafted URIs entered into the rich text editor. When other users access the affected pages or forms, the malicious scripts execute in their browsers, potentially leading to unauthorized actions such as session hijacking, credential theft, or defacement of web content. The vulnerability requires low attacker privileges (PR:L) but no authentication is needed to exploit it, and user interaction is necessary to trigger the malicious script execution (UI:P). The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), and limited impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:N). No known public exploits have been reported yet, and no official patches are currently linked, indicating the need for vigilance and proactive mitigation. The vulnerability affects all versions of Kentico Xperience as no specific version is listed, suggesting a broad impact across deployments. Given the nature of stored XSS, the attack surface includes any web pages or forms that utilize the vulnerable rich text editor, making it a significant risk for organizations relying on Kentico for content management and user interaction.

For European organizations, this vulnerability poses a risk primarily to the confidentiality and integrity of user sessions and data. Successful exploitation can lead to theft of authentication tokens, enabling attackers to impersonate legitimate users and potentially escalate privileges within the application. This can result in unauthorized access to sensitive information, defacement of public-facing websites, and erosion of user trust. The availability impact is minimal but could occur indirectly if attackers use the vulnerability to inject disruptive scripts. Organizations in sectors with high regulatory requirements for data protection, such as finance, healthcare, and government, may face compliance risks if user data is compromised. Additionally, organizations relying heavily on Kentico Xperience for customer-facing portals or internal collaboration tools may experience reputational damage and operational disruption. The medium severity rating reflects the moderate ease of exploitation combined with limited but meaningful impact on confidentiality and integrity. The lack of known exploits currently provides a window for remediation before widespread attacks occur.

1. Monitor Kentico's official security advisories and apply patches promptly once released to address CVE-2024-58318. 2. Implement strict input validation and sanitization on all user-generated content within the rich text editor to prevent injection of malicious scripts. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4. Limit the privileges of users who can access and edit content via the rich text editor to reduce the risk of malicious input. 5. Conduct regular security audits and penetration testing focused on web application components, especially those handling user input. 6. Educate content editors and administrators about the risks of injecting untrusted content and encourage cautious use of rich text features. 7. Use web application firewalls (WAFs) with rules tuned to detect and block common XSS payloads targeting Kentico Xperience. 8. Consider disabling or restricting the use of rich text editor features that allow embedding of URIs or scripts until a patch is available. 9. Review and harden authentication and session management mechanisms to mitigate the impact of stolen credentials or session tokens.