CVE-2026-106408 in Chrome
Summary
by MITRE • 10/07/2026
Protection mechanism failure in Mobile in Google Chrome on on iOS prior to 155.0.8059.39 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as CVE-2024-6789 represents a critical failure in the protection mechanisms within Google Chrome for iOS, specifically affecting versions prior to 155.0.8059.39. This flaw stems from an improper implementation of web origin policies, which are fundamental security constructs designed to isolate content loaded from different sources. By allowing a remote attacker to bypass these restrictions through the use of a crafted HTML page, the browser fails to enforce strict boundaries between scripts or resources originating from distinct domains. This type of vulnerability is categorized under CWE-284, Improper Access Control, as it permits unauthorized interaction with web content that should be restricted based on its source origin. The severity level assigned by Chromium security is Medium, indicating a significant risk that requires prompt attention to prevent potential exploitation in real-world scenarios.
From an operational perspective, the ability to bypass web origin policies enables attackers to execute cross-site scripting attacks or steal sensitive data such as cookies, session tokens, and user credentials stored within the browser context of the victim's device. When Chrome fails to properly isolate origins, malicious scripts embedded in a crafted webpage can access DOM elements, local storage, or other resources belonging to trusted websites that the user has previously visited. This undermines the trust model of the web, where users expect their interactions with one site to remain private and separate from those on another. The attack vector is remote, meaning no physical access or prior compromise of the target system is required; instead, an attacker simply needs to lure a victim into visiting a malicious URL containing the exploit code. This aligns with ATT&CK technique T1059, Command and Scripting Interpreter, specifically through browser-based execution methods that leverage legitimate software features for unauthorized purposes.
The impact of this vulnerability extends beyond immediate data theft, as it can facilitate further stages of an attack chain such as session hijacking or defacement of trusted web applications if the victim is authenticated to those services at the time of exploitation. In mobile environments like iOS, where users often maintain persistent sessions across multiple banking and social media platforms, the consequences are particularly severe. The lack of proper origin isolation means that a single malicious page can act as a pivot point for accessing high-value targets within the same browser session. This compromises not only individual privacy but also organizational security if corporate credentials or sensitive documents are accessed via Chrome on iOS devices used by employees.
Mitigation strategies primarily involve updating Google Chrome to version 155.0.8059.39 or later, where these protection mechanisms have been strengthened and the origin bypass flaw has been addressed. Users should enable automatic updates for their browser applications to ensure they receive security patches promptly as they are released. Additionally, implementing Content Security Policy headers on web servers can provide an additional layer of defense by restricting how resources are loaded and executed within a page, thereby reducing the effectiveness of such exploits even if the underlying vulnerability exists. Educating users about the risks of visiting untrusted websites and avoiding clicking on suspicious links remains a vital complementary measure to technical controls in mitigating this threat landscape effectively.