CVE-2025-53084 is a critical cross-site scripting (XSS) vulnerability classified under CWE-79, affecting the WWBN AVideo platform versions 14.4 and the development master branch at commit 8a8954ff. The vulnerability resides in the videosList page parameter, where insufficient input sanitization allows an attacker to inject and execute arbitrary JavaScript code within the victim's browser. This occurs when a specially crafted HTTP request is sent to the vulnerable endpoint, and the victim user visits a maliciously crafted webpage or link. The flaw enables attackers to hijack user sessions, steal cookies, perform actions on behalf of the user, or deliver further malicious payloads, compromising confidentiality, integrity, and availability of user data and platform functionality. The CVSS 3.1 base score is 9.0 (critical), reflecting network attack vector, low attack complexity, required privileges (PR:L), user interaction (UI:R), and scope change (S:C), with high impact on confidentiality, integrity, and availability. Although no public exploits are currently reported, the vulnerability's nature and severity make it a high-risk target for attackers. The vulnerability affects all deployments running the specified versions of AVideo, a popular open-source video hosting platform, often used by educational institutions, media companies, and enterprises for video streaming and content management. The lack of an official patch at the time of publication necessitates immediate mitigation efforts to prevent exploitation.

For European organizations, exploitation of CVE-2025-53084 could lead to severe consequences including unauthorized access to user accounts, data leakage, session hijacking, and potential platform defacement or disruption. Organizations using AVideo for internal or public-facing video services risk exposure of sensitive information and loss of user trust. The critical nature of the vulnerability means attackers can execute arbitrary scripts with the privileges of the victim user, potentially leading to lateral movement within networks or further compromise of connected systems. This is particularly impactful for sectors relying on secure video communications such as education, government, and media companies. The requirement for user interaction (visiting a malicious link) means phishing or social engineering campaigns could be leveraged to exploit this vulnerability at scale. Given the widespread adoption of video platforms in Europe, the threat could disrupt digital services and content delivery, impacting business continuity and regulatory compliance, especially under GDPR where data breaches must be reported.

1. Immediate application of any available patches or updates from WWBN once released. 2. In the absence of official patches, implement strict input validation and output encoding on the videosList page parameter to neutralize malicious scripts. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 4. Limit user privileges to the minimum necessary, reducing the impact of compromised accounts. 5. Educate users and administrators about the risks of clicking untrusted links and recognizing phishing attempts. 6. Monitor web server logs and application behavior for unusual requests targeting the videosList parameter. 7. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block XSS payloads targeting this vulnerability. 8. Conduct regular security assessments and code reviews focusing on input handling in web applications. 9. Isolate critical video services from other network segments to contain potential breaches. 10. Prepare incident response plans specific to web application attacks involving XSS.