Vulnerability · Published Nov 4, 2026 · Assigned by VulnCheck

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

Critical 9.6

In plain English

A critical-severity security flaw in VitaFit from Shenzhen Shine Industrial Co., Ltd.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)0.2%top 86.0% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Shenzhen Shine Industrial Co., Ltd.	VitaFit	0 – before 2026-10-30

Weakness: CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References

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