CVE-2026-106205 in Chrome
Summary
by MITRE • 10/06/2026
Missing authorization in Passwords in Google Chrome on on Android prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as missing authorization in Google Chrome for Android, specifically affecting versions prior to 155.0.8059.39, represents a critical failure in the browser's access control mechanisms within its rendering engine architecture. This flaw allows an attacker who has already achieved code execution or arbitrary script injection within a renderer process to escalate privileges and bypass site isolation protections. Site isolation is a fundamental security feature designed to prevent cross-site scripting attacks from leaking sensitive data between different origins by ensuring that each origin runs in a separate browser process with distinct memory spaces. When this mechanism fails, the strict boundaries intended to contain malicious activity are effectively dissolved, allowing compromised renderer processes to access resources or state information belonging to other sites.
From a technical perspective, the root cause lies in an improper check of authorization tokens or permissions when handling certain internal API calls or inter-process communication channels within the Chromium engine. An attacker leveraging this vulnerability can craft a specific HTML page that exploits these unchecked pathways to communicate with privileged components of the browser outside its designated sandboxed environment. By manipulating these interactions, the malicious script can read cookies, local storage data, or other sensitive artifacts associated with different origins than the one currently being rendered. This bypass is particularly dangerous because it undermines the core assumption of modern web security that a compromised page cannot affect others on the same device unless explicit cross-origin permissions are granted by the user.
The operational impact of this vulnerability is severe for users relying on Chrome for Android to handle sensitive transactions, such as online banking or accessing corporate portals. If an attacker successfully exploits this flaw through a malicious website visited by the victim, they can potentially steal session tokens, authentication credentials, and personal identifiable information stored in browser storage mechanisms associated with other sites. This leads directly to account takeover, financial fraud, and significant privacy breaches. The severity is rated as medium within the Chromium security framework because while it requires initial compromise of a renderer process, which often involves social engineering or drive-by downloads, the resulting loss of isolation significantly amplifies the potential damage window for subsequent attacks against other services accessed by the user on the same device.
In terms of industry classification standards, this vulnerability aligns with CWE-269, Improper Privilege Management, as it involves a failure to enforce proper access controls during runtime operations within the browser's internal architecture. Furthermore, from an adversarial simulation perspective using the MITRE ATT&CK framework for mobile platforms, this exploit technique relates to techniques involving privilege escalation and defense evasion by bypassing containerization or sandboxing mechanisms like T1055 or specific Android-specific isolation failures. The ability to break out of a renderer process effectively neutralizes one of the primary layers of defense against cross-site scripting attacks, making it a high-value target for advanced persistent threats seeking long-term access to user data without triggering standard security alerts associated with obvious malware behavior.
Mitigation strategies primarily focus on timely patching and configuration hardening. Users must update Google Chrome on Android to version 155.0.8059.39 or later, where the authorization checks have been corrected to ensure that renderer processes cannot access resources outside their designated origin context without explicit permission. Organizations should enforce automatic updates for corporate devices managed through Mobile Device Management solutions to reduce exposure time. Additionally, enabling strict content security policies and disabling unnecessary browser features can limit the attack surface available to initial compromise vectors. Security awareness training remains critical as this vulnerability requires an initial foothold via a crafted web page, meaning that preventing users from visiting untrusted or malicious sites is the most effective first line of defense against exploitation attempts targeting this specific flaw in site isolation logic.