CVE-2025-13107 is a vulnerability identified in the compositing implementation of Google Chrome versions prior to 140.0.7339.80. The compositing process in browsers is responsible for rendering and layering visual elements on the screen. An inappropriate implementation in this component allows a remote attacker to craft a specially designed HTML page that can perform UI spoofing. UI spoofing involves deceiving users by displaying fake or misleading interface elements, potentially tricking them into performing unintended actions or divulging sensitive information. The vulnerability is classified under CWE-451, which relates to improper implementation leading to security issues. The CVSS v3.1 base score is 4.3 (medium), with attack vector network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), and no impact on confidentiality or integrity but a low impact on availability (A:L). This means the attacker can exploit the vulnerability remotely without prior access but requires the user to interact with the malicious content. While the vulnerability does not directly compromise data confidentiality or integrity, the UI spoofing can facilitate phishing or social engineering attacks by misleading users. No public exploits have been reported yet, but the presence of this flaw in a widely used browser makes it a potential target for attackers aiming to deceive users. The vulnerability was published on November 14, 2025, and no patch links were provided in the source, indicating organizations should monitor official Google Chrome updates and apply patches promptly once available.

For European organizations, the primary impact of CVE-2025-13107 lies in the potential for UI spoofing attacks that can lead to social engineering or phishing incidents. Although the vulnerability does not directly expose confidential data or allow code execution, successful UI spoofing can trick users into divulging credentials, installing malware, or performing unauthorized transactions. This risk is particularly significant for sectors relying heavily on web-based applications, such as finance, healthcare, and government services. The requirement for user interaction means that user training and awareness remain critical components of defense. Additionally, availability impact is minimal but could cause minor disruptions if exploited at scale. Organizations using outdated Chrome versions are more vulnerable, and failure to update could lead to increased phishing success rates and associated financial or reputational damage. Given the widespread use of Google Chrome across Europe, the vulnerability presents a moderate risk that should be addressed promptly to maintain trust and security in digital services.

1. Immediate update of all Google Chrome installations to version 140.0.7339.80 or later once patches are available. 2. Implement browser policies that enforce automatic updates and restrict installation of outdated versions. 3. Conduct user awareness training focused on recognizing phishing and UI spoofing attempts, emphasizing caution with unexpected or suspicious web content. 4. Deploy web filtering solutions that can detect and block malicious HTML pages designed for UI spoofing. 5. Utilize browser security features such as site isolation, strict content security policies (CSP), and disabling unnecessary browser extensions that could exacerbate UI spoofing risks. 6. Monitor threat intelligence feeds for any emerging exploits targeting this vulnerability to enable rapid incident response. 7. For high-risk environments, consider additional endpoint protection measures that can detect anomalous browser behavior. 8. Engage in regular security assessments and penetration testing to evaluate the effectiveness of mitigations against UI spoofing threats.