CVE-2025-5067 is a security vulnerability identified in the Tab Strip component of Google Chrome versions prior to 137.0.7151.55. The flaw arises from an inappropriate implementation that allows a remote attacker to conduct UI spoofing attacks by crafting a malicious HTML page. UI spoofing involves deceiving users by manipulating the browser's interface to display misleading information, potentially tricking users into performing unintended actions or divulging sensitive information. This vulnerability is classified under CWE-290, which relates to improper authentication or authorization mechanisms. The CVSS v3.1 base score for this vulnerability is 5.4, indicating a medium severity level. The vector string (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N) shows that the attack can be launched remotely over the network without privileges or authentication, requires user interaction, affects confidentiality and integrity to a limited extent, but does not impact availability. No known exploits are currently reported in the wild, and no official patches or mitigation links have been published at the time of this report. The vulnerability's exploitation hinges on convincing a user to visit a specially crafted webpage that manipulates the tab strip UI, potentially leading to phishing or social engineering attacks by mimicking trusted browser elements or tabs.

For European organizations, this vulnerability poses a moderate risk primarily in the context of social engineering and phishing campaigns. Since the attack requires user interaction, the threat is more significant in environments where users frequently browse the internet and may be targeted with malicious links or emails. Confidentiality and integrity impacts are limited but could facilitate credential theft or unauthorized actions if users are deceived by the spoofed UI. Organizations handling sensitive data, financial transactions, or critical communications could see increased risk if attackers leverage this vulnerability to impersonate trusted sites or browser elements. The lack of availability impact means service disruption is unlikely. However, the widespread use of Google Chrome across European enterprises and public sectors amplifies the potential attack surface. Additionally, sectors with high regulatory requirements for data protection, such as finance, healthcare, and government, may face compliance risks if user credentials or sensitive information are compromised through such spoofing attacks.

European organizations should prioritize updating Google Chrome to version 137.0.7151.55 or later as soon as it becomes available to address this vulnerability. In the absence of an official patch, organizations can implement browser hardening policies, such as disabling or restricting the use of untrusted extensions and enforcing strict content security policies (CSP) to limit the execution of malicious scripts. User awareness training is critical to reduce the risk of falling victim to UI spoofing attacks; users should be educated to recognize suspicious browser behaviors and verify URLs and security indicators before entering sensitive information. Network-level protections, including web filtering and URL reputation services, can help block access to known malicious sites hosting crafted HTML pages. Additionally, deploying endpoint detection and response (EDR) solutions capable of identifying anomalous browser activity may provide early warning signs of exploitation attempts. Regular security assessments and penetration testing focusing on phishing and UI spoofing scenarios can help identify organizational vulnerabilities related to this threat.