CVE-2026-95374 in Chrome
Summary
by MITRE • 09/29/2026
Incorrect authorization in Network in Google Chrome prior to 154.0.8037.57 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 • 09/29/2026
The vulnerability identified as an incorrect authorization issue within the network subsystem of Google Chrome, specifically affecting versions prior to 154.0.8037.57, 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 deficiency lies in how the browser handles authorization checks during network requests initiated by maliciously crafted HTML pages. Instead of strictly validating whether the requesting context has permission to access specific resources or perform certain actions across origin boundaries, the implementation fails to apply these restrictions consistently. This oversight enables an attacker who controls a web page hosted on one domain to interact with APIs, fetch data from, or manipulate states associated with another trusted domain without proper authentication or authorization tokens being validated correctly by the browser engine.
From a technical perspective, this vulnerability falls under the category of broken access control mechanisms within client-side applications. It aligns closely with CWE-269, which describes Improper Privilege Management, and more specifically relates to issues where an actor is able to perform actions without having been granted explicit permission. In the context of web browsers, this often manifests as a failure in the Same-Origin Policy (SOP) enforcement or Cross-Origin Resource Sharing (CORS) validation logic within the Chromium engine's networking stack. When a crafted HTML page executes scripts that attempt to make cross-origin requests, the browser is expected to inspect the origin header and verify if the target server has explicitly allowed such access via CORS headers. However, due to this authorization flaw, the browser may erroneously permit these requests or expose sensitive data structures that should remain isolated within their respective origins. This breakdown in isolation allows for potential information disclosure where an attacker can read responses from protected endpoints, effectively bypassing the sandboxed environment intended by modern web standards.
The operational impact of such a vulnerability is substantial, particularly when exploited through social engineering tactics like phishing or drive-by downloads. An attacker could craft a malicious webpage that automatically triggers these unauthorized network requests in the background while a victim visits the site with their Chrome browser open and authenticated to other services. This scenario facilitates Cross-Site Request Forgery (CSRF) attacks where actions are performed on behalf of the user without consent, or it enables data exfiltration where sensitive information from one web application is stolen by another malicious domain. Furthermore, this type of flaw can be chained with other vulnerabilities to escalate privileges within the browser context or lead to full account takeover if session tokens or personal identifiable information are exposed through these unauthorized channels. The severity rating of Medium reflects that while exploitation requires user interaction such as visiting a specific page, the potential for data theft and unauthorized actions makes it a critical concern for enterprise environments relying on Chrome for secure web browsing.
To mitigate this risk, organizations must ensure that all instances of Google Chrome are updated to version 154.0.8037.57 or later where these authorization checks have been corrected in the Chromium codebase. Administrators should implement automated patch management systems to deploy security updates promptly upon release. Additionally, deploying Content Security Policy (CSP) headers on web applications can provide an additional layer of defense by restricting which sources are allowed to load resources and execute scripts, thereby reducing the attack surface even if a browser-level vulnerability exists. Users should also be educated about the risks of visiting untrusted websites while logged into sensitive accounts. From a monitoring perspective, security teams should look for anomalous network traffic patterns originating from user workstations that indicate unauthorized cross-origin requests or unusual data exfiltration attempts, which could signal an active exploitation attempt against this vulnerability in environments where patching has not yet been completed.