CVE-2025-62042 is a cross-site scripting (XSS) vulnerability identified in the Event post product developed by Bastien Ho, affecting versions up to and including 5.10.3. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows an attacker to inject malicious scripts that execute in the browsers of other users viewing the affected pages. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) indicates that the attack can be performed remotely over the network with low attack complexity, but requires the attacker to have some level of privileges (PR:L) and for the victim to interact with the malicious content (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact includes limited confidentiality loss (e.g., theft of session tokens or sensitive data), integrity loss (e.g., manipulation of displayed content), and availability loss (e.g., denial of service via script execution). Although no known exploits are currently reported in the wild and no official patches have been linked, the vulnerability poses a tangible risk to users of the Event post platform, especially in environments where multiple users interact with event content. The lack of CWE identifiers and patch links suggests that the vulnerability is relatively new and may be under active development for remediation. Organizations relying on this software should prioritize assessment and mitigation to prevent exploitation.

For European organizations, the impact of CVE-2025-62042 can be significant, particularly for those operating public-facing event management websites or intranet portals using the Event post product. Successful exploitation could allow attackers to execute arbitrary scripts in the context of authenticated users, potentially leading to session hijacking, unauthorized actions, or data leakage. This can undermine user trust, lead to regulatory non-compliance (e.g., GDPR violations due to data exposure), and disrupt business operations. The medium severity rating reflects that while the vulnerability requires some privileges and user interaction, the consequences can affect confidentiality, integrity, and availability of information systems. Organizations in sectors such as event management, education, government, and corporate communications are particularly at risk. The absence of known exploits currently provides a window for proactive mitigation, but the changed scope indicates that the vulnerability could affect multiple components or users beyond the initially targeted area, increasing potential damage.

To mitigate CVE-2025-62042, organizations should first monitor for official patches or updates from Bastien Ho and apply them promptly once available. In the interim, implement strict input validation and output encoding on all user-supplied data within the Event post platform to prevent script injection. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. Limit user privileges to the minimum necessary to reduce the attack surface, and educate users about the risks of interacting with suspicious links or content. Conduct regular security assessments and penetration testing focused on web application vulnerabilities. Additionally, consider implementing web application firewalls (WAFs) with rules designed to detect and block XSS payloads. Logging and monitoring should be enhanced to detect anomalous activities indicative of exploitation attempts. Finally, review and update incident response plans to address potential XSS incidents effectively.