CVE-2025-52707 is a Stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the FirelightWP Firelight Lightbox plugin up to version 2.3.16. The vulnerability arises due to improper neutralization of user-supplied input during web page generation, allowing malicious scripts to be stored and subsequently executed in the context of users' browsers when they view affected pages. This type of vulnerability enables attackers to inject arbitrary JavaScript code that can execute with the privileges of the victim user, potentially leading to session hijacking, defacement, redirection to malicious sites, or unauthorized actions performed on behalf of the user. The CVSS 3.1 base score is 6.5 (medium severity), with vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L, indicating that the attack can be launched remotely over the network with low attack complexity, requires privileges (likely contributor or editor level) and user interaction (victim must view the malicious content). The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability at a low level. No known exploits are currently in the wild, and no patches have been linked yet. Firelight Lightbox is a WordPress plugin used to display images and galleries in a lightbox overlay, commonly installed on websites to enhance media presentation. The vulnerability's exploitation requires an attacker to have some level of authenticated access to inject malicious scripts, which are then stored and executed when other users access the affected pages. This stored XSS is more dangerous than reflected XSS because it persists and can affect multiple users over time. Given the plugin's usage in WordPress sites, the vulnerability could be leveraged to compromise site visitors or administrators, steal cookies, or perform actions under the victim's identity within the site context.

For European organizations, especially those relying on WordPress websites enhanced with Firelight Lightbox, this vulnerability poses a moderate risk. Attackers with contributor-level access could inject malicious scripts, potentially compromising user sessions, stealing sensitive data, or defacing websites. This can lead to reputational damage, loss of customer trust, and regulatory non-compliance, particularly under GDPR where personal data exposure is involved. E-commerce, government, and media websites using this plugin are at higher risk due to the sensitivity and volume of user interactions. The vulnerability could also be used as a foothold for further attacks within the network if administrative users are targeted. Although exploitation requires some authentication and user interaction, the widespread use of WordPress in Europe and the popularity of media plugins increase the attack surface. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits after public disclosure. The medium severity rating reflects the moderate impact on confidentiality, integrity, and availability, but the requirement for privileges and user interaction limits the ease of exploitation.

Monitor official FirelightWP channels and WordPress plugin repositories for security patches addressing CVE-2025-52707 and apply updates promptly once available. Implement strict role-based access control (RBAC) on WordPress sites to limit contributor or editor privileges only to trusted users, minimizing the risk of malicious script injection. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious input patterns that could indicate XSS payloads targeting the Firelight Lightbox plugin. Conduct regular security audits and code reviews of customizations involving the Firelight Lightbox plugin to ensure no additional input sanitization issues exist. Educate site administrators and content contributors about the risks of XSS and safe content handling practices, including avoiding embedding untrusted HTML or scripts. Use Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit the domains from which scripts can be loaded, reducing the impact of potential XSS payloads. Implement security plugins for WordPress that can detect and quarantine suspicious content or script injections related to the plugin. Regularly backup website data and configurations to enable quick restoration in case of compromise resulting from exploitation of this vulnerability.