What is CVE-2021-27817?

CVE-2021-27817 is a critical-severity vulnerability in Shopxo, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-03-15.

How severe is CVE-2021-27817?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Shopxo

CVE-2021-27817

A remote command execution vulnerability in shopxo 1.9.3 allows an attacker to upload malicious code generated by phar where the suffix is JPG, which is uploaded after modifying the phar suffix.

Vulnerability class: Unrestricted File Upload

Published 2021-03-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.032 (87.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000

Affected products

Shopxo — versions 1.9.3

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

github.com/gongfuxiang/shopxo (Product)
github.com/h4ckdepy/vuls/blob/main/shopxo.md (Broken Link)

Frequently asked questions

What is CVE-2021-27817?: CVE-2021-27817 is a critical-severity vulnerability in Shopxo, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-03-15.
How severe is CVE-2021-27817?: Critical severity. CVSS v3 base score is 9.8 out of 10.