CVE-2026-95312 in Chrome
Summary
by MITRE • 09/29/2026
Information leak in Passwords in Google Chrome prior to 154.0.8037.57 allowed a remote attacker who had compromised the renderer process to obtain cross-origin data 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 information leak within Google Chrome versions prior to 154.0.8037.57 represents a significant breach in browser isolation mechanisms, specifically targeting the integrity of cross-origin data protection. This flaw allows for the unauthorized extraction of sensitive user data by exploiting weaknesses in how the rendering engine handles memory and state across different security contexts. The core issue lies in the failure to properly segregate resources or sanitize output when processing crafted HTML content, which enables an attacker who has already achieved a foothold within the renderer process to bypass same-origin policies that are designed to prevent such data exfiltration.
From a technical perspective, this vulnerability is classified under CWE-200, which covers Information Exposure, and more specifically aligns with CWE-359 regarding exposure of private information through side channels or improper isolation. The attacker leverages the compromised renderer process, which typically operates in a sandboxed environment to limit damage from malicious web content. However, due to this specific flaw, the renderer can execute crafted HTML that manipulates internal browser states or memory structures to read data belonging to other origins. This effectively neutralizes the security boundary between tabs or frames loaded from different domains, allowing for the theft of cookies, local storage contents, session tokens, and other sensitive cross-origin resources.
The operational impact of this vulnerability is severe in scenarios where an attacker has managed to inject malicious code into a user's browsing session through phishing, drive-by downloads, or compromised advertisements. Once the renderer process is compromised, the ability to exfiltrate data across origins means that even if the initial entry point was limited in scope, the potential for widespread data theft increases dramatically. Attackers can construct sophisticated social engineering attacks where users are tricked into visiting a malicious page that silently harvests credentials or session identifiers from other open tabs within the same browser instance. This undermines user trust and exposes organizations to risks of account takeover and unauthorized access to corporate resources if employees use personal browsers for work-related activities.
In terms of threat modeling, this activity corresponds to techniques found in the MITRE ATT&CK framework, particularly T1059 Command and Scripting Interpreter when considering the execution context within the renderer, but more accurately maps to T1213 Data from Information Repositories or T1530 Data from Local System if focusing on the retrieval aspect. The exploitation chain typically involves an initial compromise of the renderer via a vulnerability in web content processing, followed by the use of this information leak to pivot and gather intelligence for further attacks such as credential stuffing or session hijacking.
Mitigation strategies primarily involve immediate patching to version 154.0.8037.57 or later, which addresses the underlying logic errors responsible for the isolation failure. Organizations should enforce strict browser update policies across all endpoints to ensure that security patches are applied promptly upon release. Additionally, implementing Content Security Policy headers can help mitigate some aspects of cross-origin data leakage by restricting how resources are loaded and executed within web pages. Users should also be educated on recognizing suspicious URLs and avoiding interaction with untrusted content, although technical controls remain the most effective defense against this class of vulnerability. Regular auditing of browser configurations and disabling unnecessary plugins or extensions that may interact poorly with modern rendering engines can further reduce the attack surface available to adversaries seeking to exploit such flaws.