CVE-2026-17767 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in WebView in Google Chrome on Android prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical cross-origin data leakage issue within the WebView component of Google Chrome on Android systems prior to version 151.0.7922.72. The flaw stems from inadequate validation mechanisms that fail to properly sanitize untrusted input received through web content, creating an avenue for malicious actors to exploit compromised renderer processes. The vulnerability falls under the category of insufficient input validation, which is categorized as CWE-20 by the Common Weakness Enumeration framework and aligns with ATT&CK technique T1059.004 for input validation bypasses.
The technical implementation of this vulnerability allows a remote attacker who has already gained control of a renderer process to craft malicious HTML pages that can extract cross-origin data from other web applications or domains. This occurs because the WebView component does not sufficiently validate or sanitize input parameters before processing them, enabling attackers to manipulate the rendering pipeline and access sensitive information that should remain isolated between different origins. The medium severity classification by Chromium security team reflects the specific conditions required for exploitation, which include prior compromise of the renderer process.
The operational impact of this vulnerability extends beyond simple data leakage, as it enables sophisticated attacks that could lead to credential theft, session hijacking, or exposure of sensitive user information across different web domains. Attackers can leverage this weakness to construct cross-site scripting payloads that bypass traditional security boundaries, potentially compromising user privacy and application integrity. The vulnerability specifically affects Android users of Chrome WebView components where the renderer process has been compromised, making it particularly dangerous in environments where privilege escalation or other initial compromises are already achieved.
Mitigation strategies should focus on immediate system updates to Chrome version 151.0.7922.72 or later, which includes patches addressing the input validation gaps in WebView components. Organizations should implement additional network monitoring to detect anomalous cross-origin data access patterns and consider deploying web application firewalls that can identify and block suspicious HTML content. The security community should also implement regular vulnerability assessments focusing on renderer process isolation and input sanitization mechanisms within mobile browser components, following best practices outlined in OWASP Mobile Security Project guidelines for secure mobile application development.
This vulnerability demonstrates the critical importance of robust input validation in web rendering engines and highlights potential attack vectors that could be exploited by sophisticated adversaries who have already achieved initial compromise. The flaw represents a significant risk to user privacy and data integrity when combined with other exploitation techniques, emphasizing the need for comprehensive security architectures that protect against both direct attacks and post-compromise lateral movement within browser environments.