Auth bypass in Opensourcepos Open Source Point Of Sale
CVE-2026-33730
Open Source Point of Sale (opensourcepos) is a web based point of sale application written in PHP using CodeIgniter framework. Prior to version 3.4.2, an Insecure Direct Object Reference (IDOR) vulnerability allows an authenticated low-privileged user to access the password change functionality of other users, including administrators, by manipulating the `employee_id` parameter. The application does not verify object ownership or enforce authorization checks. Version 3.4.2 adds object-level authorization checks to validate that the current user owns the employee_id being accessed.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (26.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Opensourcepos Open Source Point Of Sale
- Opensourcepos — versions < 3.4.2
Weakness classification (CWE)
References
- github.com/opensourcepos/opensourcepos/security/advisories/GHSA-mcc2-8rp2-q6ch (Exploit, Mitigation, Vendor Advisory)
- github.com/opensourcepos/opensourcepos/commit/ee4d44ed396097d6010c5490ab4fd7cfa… (Patch)
Frequently asked questions
- What is CVE-2026-33730?
- CVE-2026-33730 is a medium-severity vulnerability in Opensourcepos Open Source Point Of Sale, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-03-27.
- How severe is CVE-2026-33730?
- Medium severity. CVSS v3 base score is 6.5 out of 10.