CVE-2025-67545 identifies a stored Cross-site Scripting (XSS) vulnerability in the FirePlugins FireBox product, affecting all versions up to and including 3.1.0-free. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious scripts that are stored persistently within the application. When other users access the affected pages, these scripts execute in their browsers with the privileges of the web application, potentially enabling attackers to steal session cookies, perform actions on behalf of users, or redirect users to malicious sites. Stored XSS is particularly dangerous because the malicious payload is saved on the server and served to multiple users, increasing the attack surface. No CVSS score has been assigned yet, and no known exploits have been reported in the wild, indicating the vulnerability is newly disclosed. The lack of authentication requirements for exploitation and the persistent nature of the attack vector increase the risk. FireBox is a web-based product, and the vulnerability affects its core input handling mechanisms. The absence of patch links suggests that a fix is not yet publicly available, underscoring the need for immediate attention from users of the product. The vulnerability was reserved and published on December 9, 2025, by Patchstack, indicating credible identification and tracking by the security community.

For European organizations using FireBox, this vulnerability poses a significant risk to the confidentiality and integrity of user data. Exploitation could lead to session hijacking, unauthorized actions performed in the context of legitimate users, and potential data leakage. This is especially critical for organizations handling sensitive information or providing services to end-users via FireBox-powered web interfaces. The stored nature of the XSS means that multiple users can be affected once the malicious script is injected, amplifying the potential damage. Additionally, the vulnerability could be leveraged as a foothold for further attacks, including phishing or malware distribution. The lack of known exploits currently limits immediate impact, but the public disclosure increases the risk of future exploitation attempts. European entities in sectors such as finance, government, and critical infrastructure that rely on FireBox may face increased targeting due to the strategic value of their data and services.

Organizations should immediately audit their FireBox deployments to identify affected versions (<= 3.1.0-free). Until a patch is released, implement strict input validation and sanitization on all user inputs, especially those reflected in web pages. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. Monitor web application logs for unusual input patterns or script injections. Educate users about the risks of clicking suspicious links or entering unexpected data. Prepare for rapid deployment of official patches once available from FirePlugins. Consider implementing Web Application Firewalls (WAFs) with rules tailored to detect and block XSS attempts targeting FireBox. Regularly review and update security configurations to minimize attack surface exposure.