CVE-2026-73537 in Miraikan Assist App Android
Summary
by MITRE • 08/21/2026
Cross-site scripting vulnerability exists in Miraikan Assist App. If this vulnerability is exploited, an arbitrary script may be executed in the browser component (WebView) running on the affected product, resulting in the displayed content being altered.
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Analysis
by VulDB Data Team • 08/21/2026
The identified security flaw within the Miraikan Assist Application represents a classic Cross-Site Scripting (XSS) vulnerability situated specifically within its embedded WebView component. This architectural choice is common in mobile applications that require rendering dynamic web content or integrating with external services, but it introduces significant risk if input validation and output encoding are not rigorously enforced. The core technical deficiency lies in the application's failure to properly sanitize user-supplied data before passing it to the underlying HTML parser of the WebView. When malicious actors inject crafted scripts into inputs that are subsequently rendered by this component without adequate filtering, the browser engine interprets these injections as legitimate executable code rather than static text content. This breakdown in separation between data and code allows an attacker to bypass same-origin policies inherent to web technologies, effectively gaining a level of trust from the application context that should not be granted to untrusted input sources.
From an operational perspective, the exploitation of this vulnerability enables arbitrary script execution within the security sandbox of the WebView. While mobile WebViews often operate with restricted permissions compared to full desktop browsers, they still possess access to critical device features such as local storage, cookies, and potentially sensitive application state data. An attacker leveraging this flaw can manipulate the displayed content dynamically, altering user interfaces to deceive users into performing unintended actions or revealing credentials through phishing overlays injected via DOM manipulation. Furthermore, persistent XSS stored within the application's cache or database could affect multiple users over time, while reflected XSS might be triggered by a single interaction with a maliciously crafted link shared through social engineering tactics. The impact extends beyond mere visual alteration; it encompasses potential session hijacking, theft of sensitive information processed locally by the app, and defacement of the user experience which undermines trust in the application's integrity.
This vulnerability aligns directly with Common Weakness Enumeration identifier CWE-79, known as Improper Neutralization of Input During Web Page Generation commonly referred to as Cross-site Scripting. The attack vector typically falls under MITRE ATT&CK technique T1059, specifically Command and Scripting Interpretation via JavaScript within a web context. To mitigate this risk, developers must implement strict input validation on all data entering the application from external sources, ensuring that only expected character sets are accepted. More critically, output encoding must be applied consistently whenever user-generated content is rendered in HTML contexts to ensure special characters such as ampersands, less-than signs, and greater-than signs are escaped into their corresponding entity codes. Utilizing Content Security Policy headers within the WebView configuration can further restrict script execution sources, preventing inline scripts from running unless explicitly whitelisted. Additionally, employing modern frameworks that automatically handle escaping or using dedicated sanitization libraries like DOMPurify can significantly reduce the attack surface by abstracting away manual encoding errors and providing robust defense-in-depth against XSS payloads.