CVE-2026-15768 in Chrome
Summary
by MITRE • 07/15/2026
Insufficient policy enforcement in HTML-in-Canvas in Google Chrome prior to 150.0.7871.125 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical sandbox escape in Google Chrome's HTML-in-Canvas implementation that fundamentally undermines the browser's same origin policy enforcement mechanisms. The flaw existed in Chrome versions prior to 150.0.7871.125 and allowed remote attackers to execute cross-origin data access through carefully crafted HTML pages, effectively bypassing core web security boundaries that protect user privacy and application integrity. The vulnerability stems from insufficient validation of policy enforcement within the canvas rendering context, where HTML content is processed and rendered in a manner that fails to properly isolate cross-origin resources.
The technical implementation of this flaw occurs when Chrome processes HTML content within canvas elements, creating an environment where malicious actors can exploit the interaction between HTML parsing and canvas rendering. When a crafted HTML page is loaded, the browser's insufficient policy enforcement allows for unauthorized data access across origin boundaries, potentially enabling attackers to extract sensitive information from other domains or applications. This represents a classic sandbox escape scenario where the boundary protection mechanisms fail to maintain proper isolation between different security contexts.
The operational impact of this vulnerability extends beyond simple data theft to encompass potential privilege escalation and comprehensive browser compromise scenarios. Attackers could leverage this weakness to perform cross-origin resource access, potentially gaining access to cookies, local storage, or other sensitive user data that should be protected by the same origin policy. The high severity classification according to Chromium security guidelines reflects the potential for significant data exposure and the ease with which remote attackers can exploit this vulnerability without requiring user interaction beyond visiting a malicious webpage.
This vulnerability aligns with CWE-284 (Improper Access Control) and relates to ATT&CK technique T1059.001 (Command and Scripting Interpreter: PowerShell) through potential exploitation paths that could lead to additional attack vectors. The flaw demonstrates inadequate input validation and privilege separation in the browser's rendering engine, specifically within the HTML-in-Canvas processing pipeline. Organizations should immediately update to Chrome version 150.0.7871.125 or later to remediate this vulnerability, as the patch addresses the core policy enforcement deficiencies that allowed cross-origin bypasses.
The remediation approach involves implementing proper origin validation checks within canvas rendering contexts and strengthening the isolation mechanisms between different security domains during HTML processing. Security teams should monitor for exploitation attempts targeting this vulnerability and ensure all browser instances are updated to patched versions. Additionally, network monitoring solutions should be configured to detect suspicious cross-origin access patterns that might indicate exploitation attempts. The vulnerability highlights the importance of maintaining robust security boundaries in complex web rendering engines where multiple security contexts interact, emphasizing the need for comprehensive policy enforcement across all browser components.
This flaw represents a significant risk to web application security and user privacy, particularly in environments where users may encounter untrusted content or where organizations rely on browser-based isolation for security protection. The vulnerability's resolution through patch deployment underscores the critical nature of timely security updates in maintaining effective browser security postures and preventing exploitation of fundamental access control mechanisms that protect against cross-origin attacks.