CVE-2026-22072 in Health
Summary
by MITRE • 08/17/2026
Loading arbitrary external URLs through WebView components introduces malicious JS code that can steal arbitrary user tokens.
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Analysis
by VulDB Data Team • 08/17/2026
The vulnerability described involves the improper handling of input within Android WebView components, specifically allowing for the loading of arbitrary external Uniform Resource Locators. This flaw stems from a failure to adequately validate or sanitize URL inputs before they are processed by the web view engine. When an application accepts user-supplied data and uses it directly to load content in a WebView without strict restrictions on the source domain or protocol, it creates a significant security gap. An attacker can exploit this weakness by tricking a victim into interacting with maliciously crafted input that points to a remote server controlled by the adversary. This interaction allows the execution of arbitrary JavaScript code within the context of the application's web view environment.
The technical mechanism relies on the fact that WebView components often have access to sensitive browser storage mechanisms, including cookies, local storage, and session tokens used for authentication. By injecting malicious JavaScript through a loaded external URL, an attacker can bypass same-origin policy restrictions if the configuration permits script execution or if cross-site scripting vectors are present due to poor input validation. The injected code typically employs techniques such as document.cookie retrieval or accessing application-specific storage APIs to exfiltrate sensitive data back to the attacker's server. This process effectively compromises the confidentiality and integrity of user credentials, session identifiers, and other personally identifiable information stored within the web view context.
From an operational impact perspective, this vulnerability poses a severe risk to both end-users and organizations relying on mobile applications for secure transactions or access control. The theft of authentication tokens can lead directly to account takeover attacks, where unauthorized individuals gain full access to user accounts without needing passwords. In financial or enterprise contexts, this could result in significant monetary loss, data breaches, and regulatory non-compliance with standards such as GDPR or HIPAA. Furthermore, because the attack occurs within a trusted application context, users are unlikely to suspect foul play, making detection difficult until substantial damage has been done. The ability to execute arbitrary code also opens the door for further exploitation chains, including phishing attacks that mimic legitimate interfaces to harvest additional credentials.
This vulnerability aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-79, which covers Improper Neutralization of Input During Web Page Generation known commonly as Cross-site Scripting, and CWE-20 regarding improper input validation. In the context of the MITRE ATT&CK framework for mobile platforms, this behavior corresponds to techniques involving client-side code injection and data exfiltration via browser-based vectors. The attack path typically involves initial access through social engineering or malicious links, followed by execution within the web view environment, leading to credential theft and potential lateral movement if those tokens provide access to broader systems.
Mitigation strategies must focus on strict input validation and secure configuration of WebView components. Developers should implement allowlists for permitted domains rather than relying solely on blocklists, ensuring that only trusted sources are loaded into the web view. It is critical to disable JavaScript execution in WebViews unless absolutely necessary, as this removes a primary vector for such attacks. If script execution is required, content security policies must be enforced to restrict external resource loading and prevent inline scripts from running without proper nonce or hash validation. Additionally, applications should avoid exposing sensitive data like session tokens directly within the web view context where possible; instead, secure communication channels between native code and JavaScript should be established using carefully designed bridges that sanitize all passed arguments. Regular security testing, including static analysis for WebView misconfigurations and dynamic penetration testing to identify injection points, is essential to maintain a robust defense posture against these types of client-side vulnerabilities.