CVE-2025-31057 is a high-severity vulnerability classified as CWE-79, which corresponds to improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). This vulnerability affects the LambertGroup Universal Video Player, specifically versions up to and including 1.4.0. The flaw allows an attacker to inject malicious scripts into web pages viewed by other users, exploiting the lack of proper input sanitization or output encoding in the video player’s web interface. The vulnerability is of the reflected XSS type, meaning that the malicious payload is reflected off the web server in an immediate response, typically via crafted URLs or input fields that are not properly sanitized. The CVSS v3.1 base score is 7.1, indicating high severity, with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L. This means the attack can be performed remotely over the network without privileges, requires low attack complexity, no prior authentication, but does require user interaction (clicking a malicious link). The scope is changed (S:C), indicating that the vulnerability can affect resources beyond the vulnerable component, potentially impacting the confidentiality, integrity, and availability of the broader system. The impact on confidentiality, integrity, and availability is low to moderate individually but combined they contribute to the high severity rating. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was reserved in March 2025 and published in June 2025, indicating it is a recent discovery. The Universal Video Player is a web-based media player component, likely integrated into websites or web applications to deliver video content. The reflected XSS could be exploited to steal session cookies, perform actions on behalf of authenticated users, or redirect users to malicious sites, potentially leading to account compromise or further malware infection.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on the LambertGroup Universal Video Player to deliver video content on their websites or web applications. Exploitation could lead to user session hijacking, unauthorized actions performed under a user's credentials, or distribution of malware through injected scripts. This can damage user trust, lead to data breaches involving personal data protected under GDPR, and cause reputational harm. Organizations in sectors such as media, education, e-commerce, and public services that use this video player are at risk. The reflected XSS vulnerability can also be used as a stepping stone for more complex attacks, including phishing campaigns targeting European users. Given the scope change indicated in the CVSS vector, the vulnerability might allow attackers to affect other components or data beyond the video player itself, increasing the potential damage. Although no active exploits are reported yet, the public disclosure and high severity score mean attackers may develop exploits soon, increasing the urgency for mitigation.

1. Immediate mitigation should include implementing strict input validation and output encoding on all user-controllable inputs that interact with the Universal Video Player, ensuring that any data reflected in the web page is properly sanitized to neutralize script injection attempts. 2. Employ Content Security Policy (CSP) headers with restrictive script-src directives to limit the execution of unauthorized scripts in browsers. 3. Use HTTP-only and Secure flags on cookies to reduce the risk of session hijacking via XSS. 4. Monitor web traffic and logs for suspicious requests that may indicate attempted exploitation of this vulnerability. 5. If possible, temporarily disable or replace the Universal Video Player component with a safer alternative until a vendor patch is available. 6. Educate users about the risks of clicking on suspicious links, as user interaction is required for exploitation. 7. Stay alert for vendor updates or patches and apply them promptly once released. 8. Conduct a thorough security review of all web applications integrating the Universal Video Player to identify and remediate any other potential injection points. 9. Implement web application firewalls (WAF) with rules designed to detect and block reflected XSS attack patterns targeting this component.