CVE-2026-87644 in Chrome
Summary
by MITRE • 09/09/2026
Incorrect authorization in Views in Google Chrome on on Windows prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process and leveraged social engineering to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an incorrect authorization issue within Google Chrome on Windows prior to version 153.0.8010.36 represents a significant breach in the browser's multi-process architecture, specifically targeting the integrity of view handling mechanisms. This flaw allows for privilege escalation from a restricted renderer process context to a higher-privilege environment outside the sandbox boundary. The core technical deficiency lies in how Chrome validates access permissions when rendering web content through specific views or UI components on the Windows operating system. Under normal circumstances, the browser relies on strict isolation between the untrusted renderer processes and trusted browser utility processes. However, this vulnerability exposes a logic error where authorization checks are either bypassed or incorrectly evaluated during the interaction with these views, effectively weakening the sandbox enforcement that is critical for preventing arbitrary code execution in high-privilege contexts.
The operational impact of this flaw is severe because it enables remote attackers to achieve code execution outside the security sandbox when combined with social engineering tactics. An attacker does not need direct system access or physical proximity; instead, they can craft a malicious HTML page designed to exploit this specific authorization gap. When an unsuspecting user visits this crafted webpage and interacts with its elements as prompted by social engineering techniques such as phishing or deceptive prompts, the browser may inadvertently grant elevated permissions to the renderer process. This allows the attacker's code to escape the confined sandbox environment, where it is typically restricted from accessing sensitive system resources, files, or other applications. Once outside this protective boundary, the arbitrary code can perform actions with higher privileges, potentially leading to full system compromise, data exfiltration, or installation of persistent malware.
From a classification perspective, this vulnerability aligns closely with CWE-269, which denotes Improper Privilege Management, as it involves granting elevated access rights without proper verification. Furthermore, the exploitation vector relates to ATT&CK technique T1059, Command and Scripting Interpreter, specifically within the context of browser-based attacks that leverage client-side execution environments. The reliance on social engineering highlights the importance of user awareness alongside technical controls, but the primary responsibility for mitigation lies with the software vendor in ensuring robust access control lists and permission checks are consistently applied across all UI components.
To mitigate this risk, users must immediately update Google Chrome to version 153.0.8010.36 or later on Windows systems where this vulnerability is present. This patch addresses the authorization logic errors within the view handling subsystems, ensuring that renderer processes cannot leverage these specific pathways to escape sandbox restrictions. Additionally, organizations should enforce strict browser update policies and employ application whitelisting solutions to limit the execution of untrusted scripts even if a sandbox escape were attempted. Security awareness training remains crucial for educating users about the risks of interacting with unknown or suspicious web content, as social engineering serves as the primary delivery mechanism for this specific exploit chain.