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 for page and form builders. Attackers can exploit this by injecting malicious scripts through crafted URIs embedded in the rich text editor content. When legitimate users access the affected pages or forms, the malicious scripts execute in their browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed with the victim's privileges. The vulnerability requires low attacker privileges (PR:L) but does not require authentication (AT:N) and involves user interaction (UI:P) to trigger the payload. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:N). Although no known exploits are currently reported, the vulnerability poses a medium risk due to the widespread use of Kentico Xperience in enterprise web environments. The lack of available patches at the time of publication necessitates immediate mitigation efforts by affected organizations.

For European organizations, this vulnerability can lead to significant security risks including unauthorized access to user sessions, theft of sensitive data, and potential defacement or manipulation of web content. Organizations relying on Kentico Xperience for customer-facing websites or internal portals may face reputational damage and regulatory compliance issues, especially under GDPR if personal data is compromised. The medium severity score reflects moderate impact but ease of exploitation and the potential for widespread impact on web users. Attackers could leverage this vulnerability to target employees or customers, leading to broader network compromise or phishing campaigns. The impact is heightened in sectors with high web interaction such as e-commerce, government services, and financial institutions prevalent in Europe.

1. Immediately review and apply any available patches or updates from Kentico once released. 2. Implement strict input validation and output encoding on all user-generated content within the rich text editor to neutralize malicious scripts. 3. Restrict the use of the rich text editor to trusted users only and limit the ability to insert URIs or scripts. 4. Employ Content Security Policy (CSP) headers to reduce the risk of script execution from untrusted sources. 5. Monitor web application logs and user activity for unusual behavior indicative of exploitation attempts. 6. Educate content editors and administrators about the risks of injecting untrusted content. 7. Consider temporary disabling or replacing the rich text editor component if patching is delayed. 8. Conduct regular security assessments and penetration testing focused on web application vulnerabilities.