Auth bypass in Blair2004 Nexopos
CVE-2026-117606
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (20.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/Blair2004/NexoPOS/issues/2668 (issue-tracking)
- github.com/Blair2004/NexoPOS/pull/2673 (issue-tracking, patch)
- github.com/Blair2004/NexoPOS/blob/1e9b2e272026e176cba354534678a111b1832ce6/app/… (technical-description)
- github.com/Blair2004/NexoPOS (product)
- www.vulncheck.com/advisories/nexopos-through-6.3.0-missing-authorization-via-ca… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-117606?
- CVE-2026-117606 is a medium-severity vulnerability in Blair2004 Nexopos, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-28.
- How severe is CVE-2026-117606?
- Medium severity. CVSS v3 base score is 5.4 out of 10.