CVE-2026-17779 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Site Isolation in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
Site isolation represents a critical security mechanism within modern web browsers designed to prevent malicious websites from accessing data from other sites through process isolation and memory segmentation. This vulnerability in Google Chrome prior to version 151.0.7922.72 demonstrated an inadequate implementation of this protective feature, creating a pathway for remote attackers to circumvent the intended security boundaries. The flaw specifically manifested when users encountered a crafted HTML page that exploited weaknesses in how Chrome managed cross-site resource access and memory isolation between different origins.
The technical nature of this vulnerability stems from improper handling of site isolation controls during page rendering and resource loading processes. When Chrome processes maliciously constructed HTML content, the browser fails to maintain proper compartmentalization between different origins, allowing attackers to potentially access sensitive data or execute unauthorized operations across isolated site boundaries. This represents a failure in the browser's security architecture that undermines fundamental web security principles and violates established practices for maintaining process isolation.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to perform cross-site scripting attacks with elevated privileges. Remote adversaries can craft HTML pages that exploit the flawed site isolation implementation to access cached resources, cookies, or other data that should remain isolated between different origins. This creates opportunities for data exfiltration, session hijacking, and potentially more sophisticated attacks that leverage the compromised isolation boundaries.
From a cybersecurity perspective, this vulnerability aligns with CWE-276, which addresses improper privileges and access control issues in web browsers. The flaw also maps to ATT&CK technique T1059.001 for command and scripting interpreter execution, as attackers could use the bypassed isolation to execute malicious scripts across sites that should remain separate. Organizations using affected Chrome versions face increased risk of targeted attacks where adversaries leverage this vulnerability to maintain persistence or escalate privileges within user environments.
Mitigation strategies require immediate deployment of Chrome version 151.0.7922.72 or later, which includes patched implementations of site isolation controls. Additionally, security teams should implement network monitoring to detect suspicious HTML content delivery and consider deploying web application firewalls that can identify and block crafted pages designed to exploit this specific vulnerability. Regular security updates and patch management processes become critical in preventing exploitation of such browser-level security flaws that can provide attackers with persistent access to user data across multiple sites.