CVE-2026-17780 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Isolated Web Apps in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Medium)
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/30/2026
The vulnerability under discussion represents a significant security flaw in Google Chrome's implementation of isolated web apps, specifically affecting versions prior to 151.0.7922.72. This issue falls under the category of privilege escalation and navigation restriction bypass, where an attacker can manipulate the browser's security model to gain unauthorized access to restricted navigation paths. The vulnerability stems from improper validation and enforcement of isolation boundaries that should normally prevent web applications from accessing or navigating to resources outside their designated scope. Such flaws in browser security implementations can have far-reaching consequences as they directly impact the core security model that protects users from malicious content and unauthorized access to system resources.
The technical implementation flaw manifests through inadequate sanitization of navigation requests within isolated web app contexts. When a malicious actor crafts a specific HTML page containing carefully constructed navigation elements, the browser fails to properly validate these requests against established isolation policies. This allows the attacker to bypass the intended security boundaries that should prevent navigation to external domains or restricted resources. The vulnerability operates at the application layer where user-controlled input is not sufficiently validated before being processed as navigation commands. The flaw essentially creates a pathway where crafted HTML content can manipulate the browser's navigation behavior, effectively circumventing the security mechanisms designed to maintain app isolation.
From an operational perspective, this vulnerability presents a medium severity risk that enables remote attackers to execute unauthorized navigation within the context of isolated web applications. The impact extends beyond simple navigation bypass as it potentially allows for information disclosure, phishing attacks, or further exploitation through social engineering techniques. Attackers can craft malicious pages that appear legitimate to users while simultaneously executing unauthorized navigation attempts that may lead to data exfiltration or credential theft. The remote nature of this exploit means that attackers do not require local system access or physical presence to leverage this vulnerability, making it particularly concerning for enterprise environments where isolated web applications are commonly deployed.
The security implications of this vulnerability align with CWE-284 (Improper Access Control) and represent a failure in proper privilege separation within the browser's architecture. According to ATT&CK framework, this vulnerability maps to T1059 (Command and Scripting Interpreter) and potentially T1566 (Phishing) as attackers can use this flaw to redirect users to malicious sites. Organizations using isolated web applications should immediately update their Chrome installations to version 151.0.7922.72 or later to mitigate this risk. Additionally, administrators should implement network monitoring to detect unusual navigation patterns that might indicate exploitation attempts. The recommended mitigation strategy includes not only patching the browser but also reviewing existing isolated web application deployments for potential exposure and implementing additional security controls such as content security policies and enhanced monitoring of navigation behaviors within these applications.