CVE-2025-12911 is a security vulnerability identified in Google Chrome prior to version 140.0.7339.80. The issue stems from an inappropriate implementation in the browser's permission handling mechanism, which allows a remote attacker to perform UI spoofing by crafting malicious HTML pages. UI spoofing involves manipulating the browser's user interface to display deceptive content, potentially tricking users into believing they are interacting with legitimate browser prompts or trusted websites. This can lead to phishing attacks or unauthorized actions initiated by the user under false pretenses. The vulnerability does not require the attacker to have any prior authentication or elevated privileges, but successful exploitation depends on user interaction with the crafted page. Although Chromium's security team has rated this vulnerability as low severity, the absence of a CVSS score necessitates an independent assessment. There are no known exploits in the wild, and no patch links are provided, but updating to Chrome version 140.0.7339.80 or later is implied to remediate the issue. The flaw primarily affects the confidentiality and integrity of user interactions rather than system availability or core browser functionality.

For European organizations, this vulnerability poses risks mainly related to social engineering and phishing attacks that leverage UI spoofing to deceive users into divulging sensitive information or performing unintended actions. Organizations with employees using outdated Chrome versions are vulnerable to targeted attacks that could compromise credentials or facilitate further exploitation. While the direct technical impact on systems is limited, the indirect consequences include potential data breaches, loss of user trust, and compliance issues under regulations like GDPR if personal data is compromised. The widespread use of Google Chrome across Europe means a large attack surface, particularly in sectors with high reliance on web applications such as finance, healthcare, and government. The low complexity of the attack vector combined with user interaction requirements means that user awareness and training are critical components of risk reduction.

1. Immediately update all Google Chrome installations to version 140.0.7339.80 or later to ensure the vulnerability is patched. 2. Implement enterprise-wide browser update policies and automated patch management to prevent use of outdated versions. 3. Conduct targeted user awareness training focusing on recognizing suspicious web content and the risks of interacting with unexpected permission prompts or UI elements. 4. Deploy web filtering solutions to block access to known malicious or suspicious websites that could host crafted HTML pages exploiting this vulnerability. 5. Monitor network traffic and endpoint logs for unusual browser behavior or phishing attempts that may indicate exploitation attempts. 6. Encourage use of browser security features such as site isolation and strict permission controls to limit the impact of UI spoofing. 7. Coordinate with IT and security teams to integrate vulnerability scanning for browser versions and compliance reporting.