CVE-2026-95382 in Chrome
Summary
by MITRE • 09/29/2026
Improper input validation in Auth in Google Chrome prior to 154.0.8037.57 allowed a remote attacker who had compromised the renderer process and leveraged social engineering to obtain sensitive information 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 improper input validation flaw within the authentication mechanisms of Google Chrome prior to version 154.0.8037.57 represents a significant breach in the browser's isolation model, specifically targeting the boundary between renderer processes and higher-privilege components. This defect allows for the potential exfiltration of sensitive information under specific conditions where an attacker has already achieved code execution within a sandboxed renderer process. The core technical issue stems from insufficient sanitization or validation checks applied to inputs that interact with authentication subsystems, enabling malicious scripts embedded in crafted HTML pages to manipulate these interactions and bypass expected security controls.
From a technical perspective, this vulnerability leverages the complex architecture of modern web browsers where each tab runs in an isolated renderer process to limit the impact of compromise. However, when input validation is flawed within specific API calls or internal handlers related to authentication states, tokens, or session management data, it creates a pathway for information leakage. An attacker exploits this by hosting a malicious webpage that utilizes social engineering techniques to trick the user into interacting with content designed to trigger the vulnerable code path. Once triggered, the crafted HTML page can read sensitive data such as cookies, local storage entries, or authentication tokens from other origins due to the improper handling of input parameters that should have been strictly validated against cross-origin restrictions or type constraints.
The operational impact of this vulnerability is primarily centered on privacy and credential theft rather than full system compromise. Since the attack requires a compromised renderer process, it typically implies that the user has already visited a malicious site or clicked through a phishing campaign. The severity rating of Medium reflects the fact that while the attacker can steal sensitive information like session cookies or personal data stored in web storage, they do not gain direct control over the operating system or the browser's core functionality. This distinction is critical because it limits the scope to data exfiltration rather than arbitrary code execution on the host machine, although the stolen credentials could lead to further account takeovers and lateral movement within targeted services.
In terms of industry classification standards, this vulnerability aligns with CWE-20 Improper Input Validation, as the root cause is the failure to correctly validate user-supplied data before processing it in security-critical contexts. Furthermore, from a threat modeling perspective using the MITRE ATT&CK framework, this behavior corresponds to techniques such as T1539 Steal Web Session Cookie and potentially T1059 Command and Scripting Interpreter if the renderer compromise involved script execution. The attack vector also involves social engineering elements consistent with initial access strategies where human interaction is required to bypass automated defenses, highlighting the importance of user awareness alongside technical controls.
Mitigation for this vulnerability primarily relies on updating Google Chrome to version 154.0.8037.57 or later, which includes patches that enforce stricter input validation rules within the authentication modules. Organizations should ensure automatic update policies are enabled to minimize exposure windows. Additionally, users can reduce risk by employing browser extensions that block known malicious scripts and maintaining strict content security policy implementations on web applications they visit. Security teams should also monitor for indicators of compromise related to renderer process anomalies or unusual network traffic patterns indicative of data exfiltration attempts targeting authentication endpoints.