CVE-2025-53084 is a critical cross-site scripting (XSS) vulnerability identified in WWBN's AVideo platform, specifically affecting version 14.4 and the development master branch at commit 8a8954ff. The vulnerability resides in the videosList page parameter functionality, where improper neutralization of input during web page generation allows an attacker to inject arbitrary JavaScript code. This occurs because user-supplied input is not adequately sanitized or encoded before being reflected in the web page output. Exploitation requires an attacker to craft a malicious HTTP request containing the payload and trick a user into visiting a specially crafted webpage or link. Upon visiting, the malicious script executes in the context of the victim's browser, potentially leading to session hijacking, credential theft, unauthorized actions on behalf of the user, or further malware delivery. The CVSS v3.1 base score is 9.0, reflecting a critical severity level, with attack vector being network accessible (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), user interaction (UI:R), and scope change (S:C). The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H), indicating that successful exploitation can lead to significant compromise of user data and system functionality. No known exploits are currently reported in the wild, but the vulnerability's nature and critical rating suggest that exploitation could be straightforward once a working exploit is developed. No official patches or mitigations have been linked yet, so affected organizations must be vigilant and consider interim protective measures.

For European organizations using WWBN AVideo 14.4 or the affected development versions, this vulnerability poses a significant risk. AVideo is a video hosting and streaming platform often used by educational institutions, media companies, and enterprises for internal and external video content delivery. Exploitation could lead to unauthorized access to user sessions, leakage of sensitive information, and potential lateral movement within the network if administrative accounts are compromised. The critical nature of the vulnerability means that attackers could manipulate video content pages to execute malicious scripts, potentially affecting a wide user base. This could result in reputational damage, regulatory non-compliance (especially under GDPR due to data breaches), and operational disruptions. The requirement for user interaction (visiting a malicious link) means phishing or social engineering campaigns could be leveraged to maximize impact. Given the scope change and high impact on confidentiality, integrity, and availability, organizations relying on AVideo for critical communications or content delivery must prioritize addressing this vulnerability to prevent exploitation.

1. Immediate mitigation should include disabling or restricting access to the videosList page parameter functionality if feasible until a patch is available. 2. Implement strict input validation and output encoding on all user-supplied inputs, especially the videosList parameter, to neutralize potentially malicious scripts. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers, limiting the impact of XSS attacks. 4. Educate users and administrators about the risk of phishing and social engineering attacks that could deliver malicious links exploiting this vulnerability. 5. Monitor web server logs and application behavior for unusual requests or patterns indicative of attempted exploitation. 6. If possible, deploy Web Application Firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting the videosList parameter. 7. Stay alert for official patches or updates from WWBN and apply them promptly once released. 8. Conduct regular security assessments and penetration testing focusing on input validation and XSS vectors within the AVideo platform.