---
id: "CVE-2026-54376"
kind: "vulnerability"
aliases: ["CVE-2026-54376"]
title: "VitaFit Android app: custom URI scheme lets another app steal Fitbit tokens"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["android", "fitbit", "mobile", "other", "vitafit"]
not_affected_if: ["fixed-version", "ios", "no-fitbit-link"]
published_at: "2026-11-04T22:18:05+00:00"
first_seen_at: "2026-11-04T23:08:48+00:00"
updated_at: "2026-11-04T23:09:48+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54376", "first_seen_at": "2026-11-04T23:08:48+00:00"}]
exploit_sources: []
---

# VitaFit Android app: custom URI scheme lets another app steal Fitbit tokens

The VitaFit Android app (com.vt.vitafit, before 2.8.1.0) registers the callback scheme vitafit://vtio.cn, so a malicious app on the same phone can register the same scheme and receive the Fitbit login token in the callback URL. The stolen 30-day token with weight scope lets an attacker read, create and delete the victim's weight and body-fat records through the Fitbit Body API.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed VitaFit app version in the Android app settings or Play Store; affected if below `2.8.1.0`
- Check whether the Fitbit account is linked to VitaFit (Fitbit app > Apps > VitaFit)

## Fix

- VitaFit Android app: move to `2.8.1.0` or later

## Timeline

- 2026-11-04T23:08:48+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-54376

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/vitafit-android-custom-uri-scheme-token-hijacking

## From the sources

VitaFit Android application (com.vt.vitafit) before 2.8.1.0 contains an insecure custom URI scheme vulnerability that allows a malicious application to intercept Fitbit login tokens by registering the same callback scheme (vitafit://vtio.cn). Attackers can capture the 30-day Fitbit authorization token with weight scope delivered in the callback URL to read, create, and delete the victim's weight and body-fat records via the Fitbit Body API.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_