CVE-2026-106225 in Chrome
Summary
by MITRE • 10/06/2026
Missing authorization in Autofill in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as missing authorization within the autofill functionality of Google Chrome versions prior to 155.0.8059.39 represents a significant breach in data access controls, specifically affecting how sensitive user information is retrieved and displayed during web interactions. This flaw stems from an insufficient verification mechanism that fails to properly validate whether the requesting context or script has legitimate authorization to access specific autofill fields such as credit card numbers, addresses, or passwords. In modern browser architectures, autofill features are designed to streamline user experience by automatically populating form fields with previously saved data; however, this convenience introduces a complex attack surface where improper separation of privileges can lead to unauthorized data exposure. The core technical flaw lies in the lack of strict origin checks or permission validations when scripts attempt to interact with these sensitive input elements, allowing malicious code embedded within web pages to bypass standard security boundaries that would otherwise restrict access to personally identifiable information.
From an operational perspective, this vulnerability enables a remote attacker to exploit social engineering tactics to trick users into visiting a specially crafted HTML page designed to trigger the autofill mechanism without proper user consent or awareness. By leveraging techniques such as hidden iframes or deceptive form submissions, the malicious webpage can induce the browser to populate sensitive fields and subsequently extract their contents through JavaScript APIs that read input values. This process occurs silently in the background, often while the user is engaged with other tasks or believes they are interacting with a legitimate site, thereby facilitating stealthy data exfiltration. The severity of this issue is classified as medium within the Chromium security framework because it requires active user interaction and social engineering to succeed, yet its impact remains high due to the potential for large-scale theft of financial credentials and personal identity details when deployed at scale across compromised or malicious websites.
This incident aligns closely with CWE-269, which describes Improper Privilege Assignment, as the browser fails to enforce appropriate access control levels on sensitive data retrieval operations. Furthermore, it maps directly to MITRE ATT&CK technique T1059.007, specifically JavaScript execution within a web context, and can be associated with Data from Local System under collection vectors where attackers harvest credentials stored locally by applications for later use or immediate exfiltration. The exploitation path typically involves the attacker hosting malicious content that mimics legitimate login forms or payment gateways, relying on the victim's trust in the browser’s autofill feature to populate fields automatically. Once populated, scripts running within the page context can read these values and transmit them to external servers controlled by the adversary, effectively bypassing traditional perimeter defenses since the data originates from a trusted local source rather than being intercepted during network transmission.
Mitigation strategies primarily involve updating Google Chrome to version 155.0.8059.39 or later, where patches have been implemented to enforce stricter authorization checks before autofill data is exposed to web content. Administrators and end-users should ensure automatic updates are enabled to receive these security fixes promptly. Additionally, organizations can implement Content Security Policy directives that restrict the execution of scripts from untrusted origins and disable autofill for sensitive fields in high-security environments where manual entry is preferred to prevent automated harvesting. User education remains critical; individuals must remain vigilant against phishing attempts and verify the authenticity of websites before interacting with forms, especially those requesting financial or personal information. Regular audits of browser configurations and adherence to industry best practices for web application security can further reduce the risk profile associated with such client-side vulnerabilities.