CVE-2024-0809 is a vulnerability identified in Google Chrome versions prior to 121.0.6167.85, specifically related to the Autofill feature. Autofill is designed to help users quickly fill out forms by automatically entering saved data such as addresses, credit card information, and other personal details. The vulnerability arises from an inappropriate implementation of Autofill restrictions, which allows a remote attacker to bypass these restrictions by crafting a malicious HTML page. This crafted page can trick the browser into autofilling data into fields that should normally be protected or restricted, potentially leading to unauthorized data exposure or manipulation. The vulnerability is classified under CWE-693, which relates to protection mechanism failures. According to the CVSS 3.1 scoring, the vulnerability has a score of 4.3 (medium severity) with the vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N, indicating that it can be exploited remotely over the network without privileges but requires user interaction (such as visiting a malicious webpage). The impact primarily affects the integrity of user data, as attackers can manipulate autofill inputs, but does not directly compromise confidentiality or availability. No known exploits are currently reported in the wild, and no official patch links were provided at the time of this report, though it is implied that updating to version 121.0.6167.85 or later mitigates the issue.

For European organizations, this vulnerability poses a moderate risk, especially for those whose employees or customers use Google Chrome as their primary browser. The Autofill feature often contains sensitive personal and financial information, and bypassing its restrictions could allow attackers to inject or manipulate form data, potentially leading to fraudulent transactions, unauthorized data submission, or phishing attacks that appear more credible. While the vulnerability does not directly expose confidential data, the integrity compromise can facilitate social engineering or fraud schemes. Organizations in sectors such as finance, e-commerce, healthcare, and government services are particularly at risk due to the sensitive nature of the data involved. Additionally, since exploitation requires user interaction, awareness and training can mitigate risk, but the widespread use of Chrome in Europe means the attack surface is significant. The absence of known exploits in the wild reduces immediate risk but does not eliminate the potential for future attacks.

European organizations should prioritize updating Google Chrome to version 121.0.6167.85 or later to ensure the vulnerability is patched. Beyond patching, organizations should implement browser usage policies that restrict or monitor the use of autofill features, especially on sensitive systems. Deploying endpoint security solutions that detect and block malicious web content can reduce exposure to crafted HTML pages exploiting this flaw. User education is critical; employees should be trained to recognize suspicious websites and avoid interacting with untrusted links or forms. Web filtering solutions can be configured to block access to known malicious domains. For high-risk environments, consider disabling autofill features via group policies or browser configuration management. Monitoring for unusual form submissions or data anomalies can help detect exploitation attempts. Finally, organizations should maintain an up-to-date inventory of browser versions in use and enforce timely updates through centralized management tools.