CVE-2026-79262 in Chrome
Summary
by MITRE • 08/26/2026
Incorrect authorization in Network in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to bypass web origin policy 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 incorrect authorization issue within the network subsystem of Google Chrome, specifically affecting versions prior to 152.0.7977.65, represents a significant breach in web origin policy enforcement. This flaw allows remote attackers to circumvent standard security boundaries that are designed to isolate content from different origins. The core technical failure lies in how the browser handles network requests and validates their source context. When a malicious actor crafts an HTML page containing specific scripts or embedded resources, they can exploit this misconfiguration to trigger actions that should be restricted by same-origin policies. This bypass enables the attacker to access sensitive data or perform operations on behalf of the user without proper authorization checks being correctly applied during the network request lifecycle.
From a technical perspective, web origin policies are fundamental to modern browser security, preventing malicious sites from reading data from other sites such as banking portals or email services. The flaw in Chrome's implementation suggests that certain network-level requests were not properly validated against their originating context before execution. This could involve improper handling of cross-origin resource sharing headers or failures in validating the referrer and origin fields during asynchronous operations. By crafting a specific HTML page, an attacker can manipulate these validation mechanisms to trick the browser into treating a malicious request as if it originated from a trusted source. This effectively neutralizes the protective barriers that prevent unauthorized data exfiltration or state manipulation across different domains.
The operational impact of this vulnerability is substantial for end-users who rely on Chrome for secure web browsing. An attacker leveraging this flaw could potentially steal sensitive information such as session cookies, personal identifiable information, or confidential documents stored in local storage if accessed through the compromised context. Furthermore, it opens the door to cross-site request forgery attacks where actions are performed on behalf of an authenticated user without their knowledge. Since the vulnerability allows remote exploitation via a simple crafted HTML page, the attack vector is highly accessible and does not require complex setup or physical access to the victim's machine. The Chromium security severity rating of Medium reflects that while the impact can be severe depending on the context, it may have limitations in scope compared to critical memory corruption vulnerabilities.
To mitigate this risk, users must ensure they are running a version of Google Chrome that is equal to or greater than 152.0.7977.65 where these authorization checks were corrected. Organizations should enforce automated update policies to minimize the window of exposure for their workforce. Additionally, security teams can implement content security policy headers on web applications to add an additional layer of defense against cross-origin data leakage. Monitoring network logs for unusual patterns that might indicate exploitation attempts is also advisable. This incident underscores the importance of rigorous testing in browser engine development and highlights how subtle logic errors in authorization flows can lead to significant security compromises despite robust underlying infrastructure.
In terms of industry standards, this vulnerability aligns with CWE-269 which describes Improper Authorization, where a user is able to access or perform actions they are not authorized for. It also relates to the ATT&CK technique T1530 Data from Cloud Storage Object Discovery if the exploited context leads to accessing cloud-based resources improperly. The bypass of web origin policy falls under broader categories of browser security flaws that undermine trust in the browsing environment. Addressing such issues requires continuous vigilance and adherence to secure coding practices within the development lifecycle of complex software systems like web browsers.