NexoPOS through 6.3.0 Missing Authorization via Cash Register Session Actions

Advisories

NexoPOS through 6.3.0 Missing Authorization via Cash Register Session Actions

Severity: medium
Date: 10/27/2026
Affecting: NexoPOS <= 6.3.0
CVE: CVE-2026-117606
CWE: CWE-639 Authorization Bypass Through User-Controlled Key
CVSS: 5.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
References: https://github.com/Blair2004/NexoPOS/issues/2668
https://github.com/Blair2004/NexoPOS/pull/2673
https://github.com/Blair2004/NexoPOS/blob/1e9b2e272026e176cba354534678a111b1832ce6/app/Services/CashRegistersService.php#L53-L92
https://github.com/Blair2004/NexoPOS
Credit: hieuPenguinnn
Description: NexoPOS through 6.3.0 contains a missing authorization vulnerability that allows authenticated cashiers to manipulate other cashiers' register sessions because CashRegistersService never compares used_by with the user. Attackers holding the default nexopos.use.registers permission can submit closing, cash-in, or cash-out actions to POST /api/cash-registers/{action}/{register} to force-close sessions or alter balances.

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