CVE-2026-87492 in Chrome
Summary
by MITRE • 09/09/2026
Incorrect authorization in DevTools in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an incorrect authorization flaw within the DevTools component of Google Chrome prior to version 153.0.8010.36 represents a critical breach in the browser's privilege separation model. This issue stems from insufficient validation mechanisms when handling requests or commands originating from developer tools interfaces, which are typically intended for debugging and development purposes but can be manipulated by malicious actors through crafted web content. The core technical flaw lies in the failure to properly enforce access controls on specific API endpoints or internal functions that should remain restricted to trusted contexts. When a remote attacker constructs an HTML page designed to exploit this misconfiguration, they can trick the browser into executing privileged operations under the guise of legitimate developer tool interactions. This bypasses the expected security boundaries that isolate web content from system-level resources, effectively allowing code execution outside the sandbox environment where untrusted scripts are normally confined.
From a technical perspective, this vulnerability aligns with CWE-269, which describes Improper Privilege Management, specifically in contexts where an actor is granted access to functionality beyond their intended permissions. The exploitation vector relies on social engineering or drive-by download techniques where the victim visits a malicious website containing specially crafted HTML and JavaScript code. This code interacts with Chrome's DevTools infrastructure, leveraging the authorization gap to escalate privileges within the browser process. By executing arbitrary code outside the sandbox, the attacker gains capabilities that are typically reserved for higher-privileged processes, such as accessing local file systems, interacting with other applications, or modifying system configurations. The Chromium security severity rating of High reflects the significant risk posed by this flaw, as it undermines one of the primary defenses against web-based attacks: process isolation.
The operational impact of this vulnerability is severe, potentially leading to full device compromise depending on the user's privileges and installed software. An attacker who successfully exploits this issue can execute arbitrary code with the same permissions as the current user, which may include access to sensitive data stored locally by the browser or other applications running under that account. This capability facilitates further lateral movement within a network if the compromised machine is part of an enterprise environment. Furthermore, because the attack originates from a web page, it requires no prior authentication or physical access, making it suitable for widespread distribution via phishing campaigns or malicious advertisements. The ability to escape the sandbox also means that traditional browser-based mitigations like Content Security Policy may be rendered ineffective if the attacker can invoke system-level commands directly through the exploited DevTools interface.
Mitigation strategies primarily involve immediate patching of all affected Chrome installations to version 153.0.8010.36 or later, where these authorization checks have been corrected and hardened. Organizations should enforce automatic update policies for browsers across their endpoints to ensure timely remediation of such vulnerabilities. In addition to software updates, implementing application whitelisting can help restrict the execution of unauthorized binaries that might be dropped by an exploit attempting to leverage this privilege escalation. Network segmentation and strict egress filtering also reduce the blast radius in case a compromise occurs, limiting the attacker's ability to communicate with command-and-control servers or exfiltrate data. Security awareness training remains crucial for educating users about the risks of visiting untrusted websites, as user interaction is often required to trigger such drive-by exploits. Continuous monitoring and logging should be enabled to detect anomalous behavior indicative of sandbox escape attempts, allowing security teams to respond rapidly to potential incidents. This incident underscores the importance of rigorous code review processes in browser development, particularly for components like DevTools that have broad access capabilities but are frequently exposed to untrusted input from web pages.