CVE-2025-48105 is a Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Vincent Boiardt Easy Flash Embed product. This vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be stored and subsequently executed in the context of users visiting affected web pages. The vulnerability impacts all versions up to 1.0 of Easy Flash Embed, though specific affected versions are not enumerated. The CVSS v3.1 base score is 6.5, indicating a medium severity level. The vector string (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 user interaction is necessary. The scope is changed, meaning the vulnerability affects resources beyond the vulnerable component. The impact includes limited confidentiality, integrity, and availability losses. Stored XSS vulnerabilities allow attackers to inject malicious JavaScript code that is permanently stored on the target server and executed in the browsers of users who access the compromised content. This can lead to session hijacking, defacement, redirection to malicious sites, or execution of unauthorized actions on behalf of the user. Easy Flash Embed is a tool used to embed Flash content into web pages, which may be integrated into websites or content management systems. Given the decline of Flash technology, the product may still be in use in legacy or niche environments. No patches or fixes are currently available, and no known exploits have been reported in the wild as of the publication date.

For European organizations, the impact of this vulnerability depends largely on the extent of Easy Flash Embed usage within their web infrastructure. Organizations that still rely on this product for embedding Flash content on their websites or intranet portals are at risk of attackers injecting persistent malicious scripts. This can compromise user sessions, steal sensitive information, or manipulate website content, leading to reputational damage and potential regulatory consequences under GDPR if personal data is exposed. The vulnerability’s ability to affect confidentiality, integrity, and availability, albeit at a limited level, means that attackers could perform unauthorized actions or disrupt user experience. Since exploitation requires low privileges but user interaction, phishing or social engineering could be used to lure users into triggering the malicious payload. European sectors with high web presence, such as e-commerce, government portals, and educational institutions, may be particularly concerned. Additionally, the changed scope indicates that the vulnerability could impact other components or users beyond the initially vulnerable system, increasing the potential attack surface.

Given the absence of official patches, European organizations should take immediate compensating controls. First, conduct an inventory to identify any usage of Easy Flash Embed within their web environments. If found, consider disabling or removing the component until a patch is available. Employ web application firewalls (WAFs) with custom rules to detect and block typical XSS attack patterns targeting the affected endpoints. Implement strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Sanitize and validate all user inputs rigorously on the server side, especially those that are stored and later rendered in web pages. Educate users about the risks of interacting with suspicious links or content to reduce the likelihood of successful exploitation requiring user interaction. Monitor web logs and user reports for signs of unusual script execution or defacement. Finally, maintain close communication with the vendor or security advisories for updates or patches addressing this vulnerability.