What is CVE-2026-54378?

CVE-2026-54378 is a critical-severity vulnerability in Shenzhen Shine Industrial Co., Ltd. Vitafit, classified under Insufficiently Protected Credentials. CVSS score: 9.6/10. Published 2026-11-04.

How severe is CVE-2026-54378?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Vulnerability in Shenzhen Shine Industrial Co., Ltd. Vitafit

CVE-2026-54378

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.

Published 2026-11-04 · last modified 2026-11-05.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Shenzhen Shine Industrial Co., Ltd. Vitafit

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

Researcher Disclosure (technical-description, exploit)
Google Play (product)
VulnCheck Advisory: VitaFit Cloud API Broken Access Control via S3 Token Endpoint (third-party-advisory)

Frequently asked questions

What is CVE-2026-54378?: CVE-2026-54378 is a critical-severity vulnerability in Shenzhen Shine Industrial Co., Ltd. Vitafit, classified under Insufficiently Protected Credentials. CVSS score: 9.6/10. Published 2026-11-04.
How severe is CVE-2026-54378?: Critical severity. CVSS v3 base score is 9.6 out of 10.