CVE-2025-58653 is a vulnerability classified as CWE-79, which pertains to Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting (XSS). This specific vulnerability affects the JS Morisset JSM file_get_contents() Shortcode component, versions up to 2.7.1. The flaw allows an attacker to inject malicious scripts that are stored and later executed in the context of users visiting the affected web pages. The vulnerability arises because the input to the shortcode is not properly sanitized or neutralized before being embedded into the generated web page, enabling stored XSS attacks. Stored XSS is particularly dangerous because the malicious payload is saved on the server and served to multiple users, increasing the attack surface and potential impact. The CVSS 3.1 base score is 6.5, indicating a medium severity level. The vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L reveals that the attack can be performed remotely over the network with low attack complexity, requires low privileges, and some user interaction is necessary. The scope is changed, meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact on confidentiality, integrity, and availability is low to moderate, as the attacker can execute scripts that may steal user data, manipulate content, or disrupt availability to some extent. No known exploits are currently reported in the wild, and no patches have been linked yet, indicating that mitigation may rely on vendor updates or manual input sanitization by administrators.

For European organizations, this vulnerability poses a significant risk especially for those using the JS Morisset JSM file_get_contents() Shortcode in their web applications or content management systems. Stored XSS can lead to session hijacking, credential theft, defacement, or distribution of malware to users, undermining user trust and potentially violating GDPR requirements related to data protection and breach notification. The medium severity score suggests that while the vulnerability is not critical, it can still cause meaningful harm, particularly in sectors with high web traffic or sensitive user data such as finance, healthcare, and e-commerce. Exploitation could lead to reputational damage, legal consequences, and operational disruptions. Since the vulnerability requires some user interaction, phishing or social engineering could be used to increase success rates. The changed scope means that the impact could extend beyond the immediate vulnerable component, potentially affecting other integrated systems or services.

European organizations should immediately audit their use of the JS Morisset JSM file_get_contents() Shortcode and identify any instances where untrusted input is passed to this shortcode. Until an official patch is released, implement strict input validation and output encoding to neutralize any potentially malicious input. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Regularly monitor web application logs for unusual input patterns or script injections. Educate users and administrators about the risks of stored XSS and the importance of cautious interaction with web content. Additionally, consider deploying Web Application Firewalls (WAFs) configured to detect and block XSS payloads targeting this vulnerability. Once a patch is available from JS Morisset, prioritize its deployment in all affected environments. Finally, conduct penetration testing focused on XSS vectors to verify the effectiveness of mitigations.