CVE-2026-66832 Overview
CVE-2026-66832 is an information disclosure vulnerability in the Mira Android application. The app leaks sensitive authentication data when opening in-app WebView content such as shop redirect flows. The user's live session token is appended to the destination URL as a query string parameter. A persistent user identifier is embedded in the WebView's User-Agent header. These values are transmitted to third-party web properties, captured in referrer logs, and exposed to any JavaScript executing in the WebView context. The Cybersecurity and Infrastructure Security Agency (CISA) published an ICS medical advisory covering this issue, categorizing it under [CWE-598] Use of GET Request Method With Sensitive Query Strings.
Critical Impact
Session tokens and persistent user identifiers are exposed to third-party web endpoints, enabling session hijacking and cross-site user tracking.
Affected Products
- Mira Android application (mobile client for Mira medical device ecosystem)
- WebView-based in-app browsing components used for shop redirect flows
- Third-party endpoints receiving inbound traffic from the Mira app
Discovery Timeline
- 2026-08-11 - CVE-2026-66832 published to the National Vulnerability Database (NVD)
- 2026-08-12 - Last updated in NVD database
- 2026-08-13 - Exploit Prediction Scoring System (EPSS) data published
Technical Details for CVE-2026-66832
Vulnerability Analysis
The Mira Android app instantiates a WebView to render in-app web flows, including shop redirects. Before navigation, the app constructs the destination URL by appending the user's live session token as a query string parameter. It also modifies the WebView's User-Agent header to include a persistent user identifier.
This design causes the session token to appear in the outbound HTTP request line. Any downstream server records the token in access logs. If the loaded page navigates or issues subsequent requests, the token propagates through the Referer header to third-party origins. JavaScript loaded in the WebView context can read the current URL through window.location and exfiltrate the token to attacker-controlled endpoints.
The persistent identifier in the User-Agent header enables cross-site tracking. Every HTTP request the WebView issues carries this identifier, allowing third parties to correlate user activity across origins.
Root Cause
The root cause is the transmission of sensitive credentials through URL query parameters and identifying HTTP headers, mapped to [CWE-598]. Session tokens belong in Authorization headers or secure cookies scoped to the intended origin, not in URLs shared with unrelated web properties.
Attack Vector
Exploitation requires user interaction to trigger a WebView flow such as tapping a shop redirect. A network-adjacent attacker observing traffic, an operator of a third-party site receiving the redirect, or a script running inside the loaded page can capture the session token. The captured token permits impersonation of the user against the Mira backend for the token's lifetime.
No verified proof-of-concept code is publicly available. Refer to the CISA Medical Advisory and the GitHub CSAF Document for the vendor coordination record.
Detection Methods for CVE-2026-66832
Indicators of Compromise
- Outbound HTTP requests from the Mira Android app containing session token values in URL query string parameters
- Requests carrying a modified User-Agent header that includes a persistent user identifier not present in the standard Android WebView UA string
- Server-side referrer log entries at third-party origins containing tokenized URLs originating from the Mira app
Detection Strategies
- Inspect mobile network telemetry for HTTP/HTTPS requests originating from the Mira package that place authentication tokens in the URL path or query parameters
- Correlate WebView-originated traffic with unusual third-party destinations reached during shop redirect flows
- Review backend authentication logs for concurrent use of the same session token from divergent client fingerprints or IP addresses
Monitoring Recommendations
- Enable mobile threat defense telemetry on managed Android devices to flag apps transmitting credentials in URL parameters
- Instrument backend session validation to detect token reuse from unexpected user agents or geographies
- Monitor referrer headers on any first-party web assets loaded from the app for leaked token fragments
How to Mitigate CVE-2026-66832
Immediate Actions Required
- Apply the vendor update for the Mira Android app once released by the manufacturer per the CISA advisory
- Rotate or invalidate active session tokens for accounts that used affected app versions with shop redirect flows
- Restrict use of the in-app WebView shop functionality on managed devices until the patched version is deployed
Patch Information
No fixed version identifier is listed in the NVD entry at publication. Consult the CISA Medical Advisory ICSMA-26-223-01 and the corresponding CSAF document for vendor-supplied remediation guidance and update availability.
Workarounds
- Avoid tapping in-app shop or redirect links in the Mira Android app until an updated version is installed
- Use the vendor's web portal in an external browser rather than the in-app WebView where feasible
- Enforce short session token lifetimes on the backend to limit the exposure window of any leaked credential
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
