CVE-2026-87629 in Chrome
Summary
by MITRE • 09/09/2026
Incorrect authorization in Sources in Google Chrome prior to 153.0.8010.36 allowed a remote attacker leveraging social engineering to leak sensitive information via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an incorrect authorization issue within the sources component of Google Chrome prior to version 153.0.8010.36 represents a significant flaw in how the browser handles access controls for internal resources and data structures. This specific defect allows a remote attacker, who typically relies on social engineering tactics such as phishing or malicious web content delivery, to exploit misconfigured permissions within the Chromium engine. The core technical failure lies in the improper validation of user privileges when accessing sensitive sources, which are often critical components used during page rendering and script execution. By crafting an HTML page that triggers these specific code paths, an attacker can bypass intended security boundaries designed to isolate content from privileged browser processes or internal data stores.
From a technical perspective, this vulnerability falls under the category of improper access control where the application fails to enforce proper authorization policies for sensitive resources. In the context of web browsers, sources often refer to JavaScript files, CSS stylesheets, or other assets loaded by the page. If these components are not correctly isolated from higher-privilege contexts, an attacker can leverage cross-origin read bypass techniques or similar mechanisms to extract data that should remain confidential. The severity is classified as low within the Chromium security framework because it generally requires user interaction and does not provide direct remote code execution capabilities. However, the ability to leak sensitive information remains a critical concern for privacy-focused applications and enterprise environments where data exfiltration can lead to broader system compromises or intellectual property theft.
The operational impact of this vulnerability is primarily centered on confidentiality rather than integrity or availability. An attacker who successfully exploits this flaw can read sensitive information stored in browser memory, such as cookies, local storage contents, or potentially cached credentials if they are accessible through the compromised sources. This aligns with the Common Weakness Enumeration (CWE) standard under CWE-269: Improper Authorization, which describes situations where an actor is able to access resources or perform actions for which it should not have been granted access. Furthermore, this behavior maps to the MITRE ATT&CK framework technique T1530: Data from Local System, specifically within the context of browser-based data staging and exfiltration. The attacker uses social engineering to trick a user into visiting a malicious site that contains crafted HTML designed to trigger the vulnerability, thereby establishing an initial foothold for potential further exploitation or immediate data theft depending on the target's browsing habits.
Mitigation strategies for this vulnerability focus primarily on timely patching and defensive browser configurations. Users must update Google Chrome to version 153.0.8010.36 or later immediately, as these updates contain the necessary code changes to enforce stricter authorization checks within the sources component. For organizations managing large fleets of devices, deploying automated patch management solutions ensures that all endpoints are protected against this specific flaw without relying on individual user action. Additionally, implementing strict Content Security Policy (CSP) headers can help mitigate the impact by restricting which scripts and resources are allowed to execute or be accessed within a page context. This reduces the attack surface available to social engineering campaigns that rely on injecting malicious content into otherwise trusted browsing sessions.
Security teams should also consider enhancing monitoring for unusual data access patterns originating from browser processes, although detecting this specific type of low-severity exploitation may require advanced endpoint detection and response tools capable of analyzing memory reads during page load events. Educating users about the risks of visiting untrusted websites remains a critical layer of defense since social engineering is the primary vector used to trigger this vulnerability. By combining timely software updates with robust security policies and user awareness, organizations can effectively neutralize the threat posed by incorrect authorization flaws in browser components like those found in Chromium-based applications.