Vulnerability · Published Oct 28, 2026 · Assigned by VulnCheck

CVE-2026-117606NexoPOS through 6.3.0 Missing Authorization via Cash Register Session Actions

Medium 5.4

In plain English

A medium-severity authorization bypass via user-controlled key in NexoPOS from Blair2004. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 78.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Blair2004	NexoPOS	0 – through 6.3.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

https://github.com/Blair2004/NexoPOS/issues/2668 issue-tracking
https://github.com/Blair2004/NexoPOS/pull/2673 patch, issue-tracking
https://github.com/Blair2004/NexoPOS/blob/1e9b2e272026e176cba354534678a111b1832ce6/app/Services/CashRegistersService.php#L53-L92 technical-description
https://github.com/Blair2004/NexoPOS product
VulnCheck Advisory: NexoPOS through 6.3.0 Missing Authorization via Cash Register Session Actions third-party-advisory
https://hackmd.io/@hieuPenguinnn/nexopos-cash-register-cross-cashier-session-takeover exploit