VitaFit cloud API before 2026-10-30 contained an authentication bypass vulnerability that allows…

Why it is Amber

• CVSS 9.8 critical
• Remotely exploitable without logging in

References

• https://github.com/je-lv/vitafit-security-research
• https://play.google.com/store/apps/details?id=com.vt.vitafit
• https://www.vulncheck.com/advisories/vitafit-cloud-api-authentication-bypass-via-post-front-login-sns

Original description

VitaFit cloud API before 2026-10-30 contained an authentication bypass vulnerability that allows remote attackers to obtain a full session for a victim's account by submitting a linked Google or Facebook account identifier to the POST /front/login/sns/ endpoint without providing proof of ownership from the identity provider. Attackers can forge a login using an identifier exposed through account enumeration to read and modify the victim's profile and delete the account's authentication record, preventing the legitimate user from logging in.