CVE-2026-95296 in Chrome
Summary
by MITRE • 09/29/2026
Missing authorization in Core in Google Chrome on on Mac prior to 154.0.8037.57 allowed a remote attacker leveraging social engineering to obtain cross-origin data via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as missing authorization within the Core component of Google Chrome on Mac operating systems prior to version 154.0.8037.57 represents a significant flaw in how cross-origin data is handled during user interactions with web content. This issue stems from an insufficient access control mechanism that fails to properly validate whether a script or page originating from one origin has the legitimate right to access resources belonging to another distinct origin. In modern browser architectures, the same-origin policy serves as a critical security boundary designed to prevent malicious scripts on one site from reading sensitive data such as cookies, local storage, or DOM elements from another site. When this enforcement is bypassed due to missing authorization checks within the core rendering engine, the isolation between different web contexts becomes compromised, allowing for unauthorized data exfiltration under specific conditions.
The operational impact of this vulnerability centers on the potential for cross-origin data theft facilitated through social engineering tactics. An attacker can craft a malicious HTML page that exploits the lack of proper authorization to retrieve sensitive information from other websites where the victim might be logged in or have active sessions. By leveraging techniques such as phishing links or deceptive web pages, an adversary can trick users into visiting the crafted content, which then executes scripts capable of reading and transmitting cross-origin data back to the attacker's server. Although classified with a low severity rating by Chromium security standards due to the reliance on social engineering for exploitation rather than pure technical bypassing of sandbox boundaries, the potential consequences remain severe including credential theft, session hijacking, or exposure of personally identifiable information depending on the context in which the victim interacts with the malicious page.
From an industry standard perspective, this vulnerability aligns closely with CWE-269 Improper Privilege Assignment and CWE-359 Exposed Private Personal Information. The failure to enforce proper authorization checks constitutes a privilege assignment error where the browser grants access rights that should be restricted based on origin boundaries. Furthermore, the exploitation method maps directly to MITRE ATT&CK technique T1059 Command and Scripting Interpreter combined with T1213 Data from Information Repositories as attackers utilize scripting capabilities within the browser environment to extract data stored in local repositories or memory associated with other domains. This classification highlights how web-based vulnerabilities often serve as vectors for broader attack chains involving information gathering and lateral movement if such breaches occur in enterprise environments where multiple internal services might be accessed via the same browser session.
Mitigation strategies primarily involve immediate software updates to ensure that all client systems are running Google Chrome version 154.0.8037.57 or later, which includes patches for this specific authorization flaw within the Core component. Organizations should also implement strict Content Security Policy headers across their web applications to limit the types of scripts and resources that can be loaded, thereby reducing the attack surface available to potential exploiters even if browser vulnerabilities exist. Additionally, user awareness training regarding social engineering tactics remains crucial since the exploitation requires initial user interaction with a crafted page. Deploying advanced threat protection solutions capable of detecting anomalous outbound data transfers from browsers can provide an additional layer of defense against successful exfiltration attempts resulting from this vulnerability.