CVE-2025-13636 is a vulnerability identified in Google Chrome's Split View feature prior to version 143.0.7499.41. The issue stems from an inappropriate implementation that allows a remote attacker to conduct UI spoofing attacks. Specifically, by crafting a malicious domain name and persuading a user to perform certain UI gestures within the Split View interface, the attacker can manipulate the browser's UI to display deceptive content. This can mislead users into believing they are interacting with legitimate sites or browser elements, potentially facilitating phishing or other social engineering attacks. The vulnerability does not grant direct access to confidential data or allow code execution but undermines user trust and browser interface integrity. The CVSS score is 4.3 (medium), reflecting that the attack vector is network-based, requires no privileges, but does require user interaction. The vulnerability is categorized under CWE-290, which relates to authentication issues, indicating that the spoofing could bypass expected UI authentication cues. No patches or exploits are currently publicly available, but the issue is recognized and documented by the Chromium security team. The vulnerability's exploitation complexity and requirement for user interaction limit its impact, but the potential for deceptive UI manipulation remains a concern.

For European organizations, the primary impact of CVE-2025-13636 lies in the increased risk of successful phishing and social engineering attacks leveraging UI spoofing. This can lead to credential theft, unauthorized access, or fraud if users are deceived by the spoofed interface. While the vulnerability does not directly compromise data confidentiality or system integrity, the indirect consequences can be significant, especially for sectors reliant on secure user authentication such as finance, healthcare, and government services. The availability impact is minimal, as the attack does not disrupt browser functionality. However, reputational damage and user trust erosion are potential risks. Organizations with large user bases employing Chrome browsers on desktops or laptops are more exposed. The requirement for user interaction means that effective user awareness and training can mitigate some risk. Additionally, the lack of known exploits in the wild reduces immediate threat levels but does not eliminate future risk.

To mitigate CVE-2025-13636, European organizations should prioritize updating all Google Chrome installations to version 143.0.7499.41 or later, where the vulnerability is addressed. IT departments should enforce automated browser updates and verify compliance regularly. User education programs should emphasize caution with unfamiliar UI behaviors and discourage performing unusual gestures or interactions prompted by untrusted sources. Implementing browser security policies that restrict navigation to known safe domains or using enterprise-managed browser configurations can reduce exposure. Additionally, deploying advanced phishing detection tools and multi-factor authentication can help mitigate the consequences of successful UI spoofing. Monitoring for suspicious user activity and providing clear reporting channels for suspected phishing attempts will further enhance defense. Since no patches were linked in the provided data, organizations should monitor official Chromium security advisories for updates and apply them promptly.