CVE-2026-106396 in Chrome
Summary
by MITRE • 10/07/2026
Improper input validation in Omnibox in Google Chrome on on Android prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an improper input validation flaw within the Omnibox component of Google Chrome for Android, specifically in versions prior to 155.0.8059.39, represents a significant breach in web origin policy enforcement. The Omnibox serves as the primary interface where users enter URLs or search queries, and it is responsible for parsing these inputs to determine navigation targets. In this instance, the flaw stems from insufficient sanitization or validation of user-supplied data before it is processed by the browser's rendering engine. This deficiency allows a crafted HTML page, when accessed through social engineering tactics such as phishing links or malicious advertisements, to manipulate how the browser interprets the origin of the content being loaded. By exploiting this parsing inconsistency, an attacker can trick the browser into treating resources from a hostile domain as if they originated from a trusted context, thereby circumventing the Same-Origin Policy that is fundamental to web security architecture.
From a technical perspective, this vulnerability falls under the category of CWE-20: Improper Input Validation and aligns with MITRE ATT&CK technique T1059: Command and Scripting Interpreter or more specifically techniques related to browser-based attacks such as T1189: Drive-by Compromise. The core issue lies in the failure to strictly enforce boundaries between different security contexts when processing URLs that may contain encoded characters, unusual protocols, or malformed structures designed to confuse the parser. When a user is lured into visiting a malicious site via social engineering, the attacker can inject specific payloads that exploit this parsing ambiguity. These payloads are constructed to alter the perceived origin of subsequent requests or responses, potentially allowing access to sensitive cookies, local storage data, or cross-origin resources that should remain isolated from untrusted origins.
The operational impact of this vulnerability is severe due to its reliance on social engineering for exploitation. While the technical flaw exists in the browser code, successful exploitation requires user interaction, typically clicking a link or loading a page designed by an attacker. Once triggered, the bypass of web origin policies can lead to data theft, session hijacking, or further malware delivery through cross-site scripting vectors that would otherwise be blocked. For enterprise environments relying on Chrome for Android, this poses a risk to corporate data if employees access internal applications via mobile devices without adequate additional controls. The severity rating of High by the Chromium security team reflects the potential for significant unauthorized access and data exfiltration when combined with effective social engineering campaigns targeting end-users.
Mitigation strategies primarily involve immediate software updates. Administrators must ensure that all Android devices running Google Chrome are updated to version 155.0.8059.39 or later, where the input validation logic has been corrected to properly sanitize and validate URLs before processing. In environments where automatic updates cannot be enforced immediately, security awareness training is critical to reduce the success rate of social engineering attacks that serve as the delivery mechanism for this exploit. Additionally, deploying browser isolation solutions or strict content security policies can provide an additional layer of defense by restricting how web pages interact with each other and limiting the impact if a user inadvertently visits a malicious site. Regular auditing of browser configurations and keeping all client-side software patched are essential practices to maintain resilience against such origin bypass vulnerabilities.