CVE-2026-106220 in Chrome
Summary
by MITRE • 10/06/2026
Information leak in Passwords in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an information leak within the password management subsystem of Google Chrome versions preceding 155.0.8059.39 represents a critical failure in data isolation and access control mechanisms. This flaw allows a remote attacker to extract sensitive credentials, specifically stored passwords, by leveraging a crafted HTML page hosted on a malicious website or injected into an existing web context. The severity is classified as low within the Chromium security framework, yet the implications for user privacy and account security remain significant because it bypasses standard browser sandboxing protections that are designed to prevent cross-origin data access.
From a technical perspective, this vulnerability likely stems from improper handling of password storage APIs or insufficient validation when exposing stored credentials to web content. In many such cases, the flaw involves an insecure direct object reference or a logic error where the browser fails to verify the origin of the requesting script before returning sensitive authentication data. When a user visits a malicious page designed to exploit this weakness, the JavaScript code embedded in that page can invoke internal Chrome APIs intended for legitimate password managers but without proper authorization checks. This allows the attacker's script to read passwords stored by the victim browser instance and transmit them back to an external server controlled by the adversary.
The operational impact of this vulnerability is primarily centered on unauthorized access to user accounts and potential identity theft. Since web browsers often store credentials for banking, email, social media, and corporate portals, the exfiltration of these passwords can lead to comprehensive account compromise. Attackers do not need physical access to the device or elevated system privileges; they only require the victim to visit a specific URL while logged into their browser session with saved passwords enabled. This attack vector is particularly dangerous because it operates silently in the background without triggering obvious user alerts, making detection difficult for end-users who may remain unaware that their credentials have been compromised until unusual activity occurs on their accounts.
This type of vulnerability aligns closely with CWE-200, which defines an information exposure where sensitive data is disclosed to unauthorized actors, and specifically relates to CWE-798 if it involves the use of hardcoded or improperly protected default credentials in the browser's internal handling logic. In terms of offensive security frameworks, this behavior maps to MITRE ATT&CK technique T1539, which covers Steal Web Session Cookie, although here applied directly to stored password data rather than session tokens alone. It also intersects with T1078, Valid Accounts, as the stolen credentials allow attackers to authenticate using legitimate user identities.
Mitigation strategies for this vulnerability focus on immediate software updates and defensive browser configurations. The primary remediation is upgrading Google Chrome to version 155.0.8059.39 or later, where the underlying API calls have been patched to enforce stricter origin checks and sandbox boundaries. Users should ensure that automatic update notifications are enabled to receive security patches promptly after release. Additionally, enabling two-factor authentication on critical accounts provides a vital layer of defense even if passwords are exfiltrated, as it prevents attackers from successfully logging in without the secondary verification factor. For enterprise environments, implementing strict Content Security Policies and disabling password saving for sensitive applications can further reduce the attack surface by limiting the availability of credentials to potential exploit scripts.