CVE-2026-17734 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Autofill in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
The vulnerability in question represents a cross-site scripting weakness within Google Chrome's Autofill functionality that existed prior to version 151.0.7922.72. This flaw constitutes a significant security concern as it enables remote attackers to execute malicious code through carefully crafted web pages, potentially compromising user data and system integrity. The issue falls under the category of unauthorized code execution and represents a failure in proper input sanitization mechanisms within the browser's autofill component. The vulnerability is classified as a medium severity issue by Chromium security standards, indicating its potential to cause harm while not being immediately critical.
The technical implementation flaw stems from inadequate validation and sanitization of user inputs within the Autofill system when processing HTML content. When users interact with web forms that contain maliciously crafted HTML elements, the autofill mechanism fails to properly escape or filter potentially dangerous script tags or HTML attributes. This allows attackers to inject arbitrary JavaScript code that executes in the context of the victim's browsing session, creating a persistent cross-site scripting vector. The vulnerability specifically exploits how Chrome processes form data and user preferences during automated filling operations, where the system does not sufficiently validate the integrity of elements being processed.
The operational impact of this vulnerability extends beyond simple script injection, as it enables attackers to perform a range of malicious activities including credential theft, session hijacking, and data exfiltration. Users who have saved form data in Chrome's autofill system become particularly vulnerable when visiting compromised websites that contain the malicious payload. The attack surface is broad since many websites utilize form-based interactions where users expect browser autofill functionality to work seamlessly. Furthermore, this vulnerability could be leveraged as a stepping stone for more sophisticated attacks, potentially allowing attackers to establish persistent access or escalate privileges within user sessions.
Mitigation strategies should prioritize immediate patching of affected Chrome versions to the latest stable release that contains the security fix. Organizations should implement comprehensive monitoring for suspicious web traffic patterns and maintain updated browser security policies that enforce automatic updates. Security teams should conduct regular vulnerability assessments focusing on browser-based attack vectors and ensure proper input validation is enforced across all web applications. The flaw aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities, and could be mapped to ATT&CK technique T1566 for social engineering attacks that leverage browser vulnerabilities. Additionally, users should be educated about the risks of visiting untrusted websites and the importance of maintaining updated software versions to prevent exploitation of known vulnerabilities.