Arbitrary file upload in Cubecart V6
CVE-2026-45053
CubeCart is an ecommerce software solution. Prior to 6.7.0, an Authenticated Arbitrary File Upload vulnerability exists in the REST API File Manager endpoint (POST /api/v1/files) of CubeCart. The endpoint allows any holder of an API key with files:rw permission to upload PHP source files into the web-accessible images/source/ directory, where they are executed by the web server. Combined with a path-traversal flaw in the same endpoint's filepath parameter, a single API request writes a webshell anywhere the webserver process can write — including the document root — yielding full Remote Code Execution. This vulnerability is fixed in 6.7.0.
Vulnerability class: Unrestricted File Upload
EPSS: 0.006 (45.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Cubecart V6 — versions < 6.7.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-45053?
- CVE-2026-45053 is a critical-severity vulnerability in Cubecart V6, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2026-05-13.
- How severe is CVE-2026-45053?
- Critical severity. CVSS v3 base score is 9.1 out of 10.