CVE-2026-54378— VitaFit Cloud API Broken Access Control via S3 Token Endpoint

Quick assessment

Affected

Shenzhen Shine Industrial Co., Ltd. VitaFit

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

2026 年 10 月 30 日之前的 VitaFit 云 API 存在访问控制失效漏洞。该漏洞允许任何已认证用户通过调用端点获取临时的 AWS 凭证。攻击者可利用这些作用域配置不当的凭证，列出共享存储桶，并读取或覆盖其他用户上传的文件，从而导致跨用户数据的未授权访问与篡改。

CVSS 9.6 · Critical Updated Nov 05, 2026

Possible ATT&CK Techniques 2 AI

T1083 · File and Directory Discovery T1548.001 · Setuid and Setgid

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Vulnerability Information

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Vulnerability Title

VitaFit Cloud API Broken Access Control via S3 Token Endpoint

Source: CVE Program / CVE List V5

Vulnerability Description

VitaFit cloud API before 2026-10-30 contained a broken access control vulnerability that allows any authenticated user to obtain temporary AWS credentials by calling the POST /front/user/s3/token/ endpoint. Attackers can use these improperly scoped credentials to list the shared storage bucket and read or overwrite other users' stored files, enabling unauthorized cross-user data access and manipulation.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

不充分的凭证保护机制

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Shenzhen Shine Industrial Co., Ltd.	VitaFit	0 ~ 2026-10-30	-

II. Public POCs for CVE-2026-54378

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-54378

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Other References for CVE-2026-54378 (3)

https://play.google.com/store/apps/details?id=com.vt.vitafit product
https://github.com/je-lv/vitafit-security-research technical-description exploit
https://www.vulncheck.com/advisories/vitafit-cloud-api-broken-access-control-via-s3-token-endpoint third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-54378

Same Patch Batch · Shenzhen Shine Industrial Co., Ltd. · 2026-11-04 · 12 CVEs total

CVE-2026-54384	9.8 CRITICAL	VitaFit Cloud API Authentication Bypass via POST /front/login/sns/
CVE-2026-54372	8.8 HIGH	VitaFit Android < 2.8.1.0 Insecure TLS Certificate Validation
CVE-2026-54375	8.4 HIGH	VitaFit Android < 2.8.1.0 Long-Lived Session Token Exposure
CVE-2026-54376	8.2 HIGH	VitaFit Android < 2.8.1.0 Custom URI Scheme Token Hijacking
CVE-2026-54382	7.7 HIGH	VitaFit Cloud API AWS IAM Misconfiguration via Cognito S3 Access
CVE-2026-54374	7.5 HIGH	VitaFit Android < 2.8.1.0 Hardcoded Credentials Disclosure
CVE-2026-54381	7.5 HIGH	VitaFit Cloud API Storage Bucket Unauthenticated Access Information Disclosure
CVE-2026-54383	6.5 MEDIUM	VitaFit Cloud API Excessive Data Exposure via relation/search Endpoint
CVE-2026-54377	6.5 MEDIUM	VitaFit Cloud API IDOR via profile_id Endpoints
CVE-2026-54380	5.4 MEDIUM	VitaFit Cloud API Stored XSS via SVG File Upload
CVE-2026-54373	3.5 LOW	VitaFit Android < 2.8.1.0 Cleartext Traffic via Missing Network Security Config

IV. Related Vulnerabilities

Same product: VitaFit

Same vendor: Shenzhen Shine Industrial Co., Ltd.

Same weakness: CWE-522