CVE-2026-79068 in Chrome
Summary
by MITRE • 08/26/2026
Improper resource exposure in StreamsAPI in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to potentially bypass web origin policy into a privileged page via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an improper resource exposure within the StreamsAPI of Google Chrome prior to version 152.0.7977.65 represents a significant breach in web origin policy enforcement, classified under CWE-284 which denotes Improper Access Control. This flaw allows a remote attacker to potentially bypass security boundaries that are designed to isolate content from different origins, thereby enabling access to privileged pages or resources that should remain inaccessible to untrusted scripts. The core technical issue lies in the implementation of the StreamsAPI, specifically how it handles resource allocation and exposure during asynchronous data processing operations. When an HTML page crafted by an attacker interacts with this API, it can exploit inconsistencies in how stream objects are referenced and managed across different execution contexts or security domains. This misconfiguration effectively weakens the Same-Origin Policy (SOP), a critical web security mechanism that restricts how documents or scripts loaded from one origin can interact with resources from another origin.
From an operational perspective, this vulnerability enables a remote code execution scenario where malicious actors can leverage crafted HTML pages to perform cross-origin attacks without user interaction beyond visiting the compromised site. The attacker's payload likely involves constructing specific stream objects that trigger unintended side effects when processed by the browser engine, allowing data exfiltration or unauthorized manipulation of DOM elements in privileged contexts such as iframes with elevated permissions or internal browser interfaces. This type of attack falls squarely into the MITRE ATT&CK framework under techniques related to Web Protocol Tunneling and potentially Data Exfiltration over C2 channels, depending on how the stolen data is transmitted back to the attacker's server. The severity is rated as Medium by Chromium security standards because while it does not provide direct system-level access, it significantly compromises the integrity of web-based isolation models that protect users from malicious websites.
The impact extends beyond simple data theft; it undermines trust in browser sandboxing mechanisms which are foundational to modern web application security. If an attacker can bypass origin policies via StreamsAPI misuse, they may be able to inject scripts into pages where cookies or session tokens are stored securely under the assumption of strict isolation. This could lead to account takeover scenarios if combined with other vulnerabilities like Cross-Site Scripting (XSS), although in this isolated case, it primarily serves as a vector for unauthorized data access and policy evasion. The vulnerability highlights the complexity inherent in implementing robust security boundaries within complex APIs that handle asynchronous streams of binary or text data, where race conditions or reference counting errors can lead to privilege escalation at the application layer.
Mitigation strategies focus on immediate patching and defensive coding practices. Users must update Google Chrome to version 152.0.7977.65 or later, which contains the necessary code fixes to correct how StreamsAPI resources are exposed and validated against origin boundaries. For developers integrating similar APIs in custom applications, it is crucial to implement strict input validation and ensure that any stream handling logic adheres strictly to established security models like Content Security Policy (CSP) directives. Additionally, monitoring browser console logs for unusual resource access patterns can help detect exploitation attempts early. Organizations should also consider deploying Web Application Firewalls configured to recognize signatures associated with StreamsAPI abuse techniques, although client-side patching remains the primary and most effective defense against this specific vulnerability class.