CVE-2025-57966 is a Stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the GhozyLab Gallery Lightbox product up to version 1.0.0.41. This vulnerability arises from improper neutralization of input during web page generation, allowing malicious scripts to be injected and persistently stored within the application. When a victim user accesses the affected Gallery Lightbox interface, the malicious script executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability requires low privileges (PR:L) and user interaction (UI:R) to exploit, but it can be triggered remotely over the network (AV:N) without complex attack conditions (AC:L). The CVSS v3.1 base score is 6.5, indicating a medium severity level, with impacts on confidentiality, integrity, and availability (C:L/I:L/A:L). The vulnerability has been publicly disclosed as of September 22, 2025, but no patches or known exploits in the wild have been reported yet. The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component, potentially impacting the entire application or user session context. Stored XSS vulnerabilities are particularly dangerous because they can affect multiple users and persist until remediated. Given the lack of available patches, organizations using Gallery Lightbox should prioritize mitigation to prevent exploitation.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on the GhozyLab Gallery Lightbox for web content display or digital asset management. Exploitation could lead to unauthorized access to user sessions, data leakage, defacement of web content, or distribution of malware through the compromised web interface. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches due to data exposure), and cause operational disruptions. Since the vulnerability affects confidentiality, integrity, and availability, attackers could manipulate displayed content or steal sensitive information. The requirement for user interaction means phishing or social engineering could be used to lure users into triggering the exploit. European organizations with public-facing web portals or intranet systems using this product are at risk of targeted attacks, especially in sectors like government, finance, healthcare, and media where web content integrity is critical.

Specific mitigation steps include: 1) Immediate review and restriction of user input fields in the Gallery Lightbox to ensure proper input validation and output encoding, particularly for HTML and JavaScript contexts. 2) Implement Content Security Policy (CSP) headers to restrict script execution sources and reduce the impact of injected scripts. 3) Employ web application firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting Gallery Lightbox endpoints. 4) Conduct thorough code audits and penetration testing focusing on input handling and output rendering in the affected product. 5) Isolate the Gallery Lightbox application from critical internal systems to limit lateral movement if exploited. 6) Educate users about phishing risks and suspicious links that could trigger stored XSS attacks. 7) Monitor logs and user activity for unusual behavior indicative of exploitation attempts. 8) Engage with GhozyLab for updates or patches and plan for timely application once available. 9) If feasible, temporarily disable or replace the vulnerable Gallery Lightbox component until a secure version is released.