What is CVE-2021-3745?

CVE-2021-3745 is a medium-severity vulnerability in Flatcore Flatcore-Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.6/10. Published 2021-10-28.

How severe is CVE-2021-3745?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Arbitrary file upload in Flatcore Flatcore-Cms

CVE-2021-3745

flatcore-cms is vulnerable to Unrestricted Upload of File with Dangerous Type

Vulnerability class: Unrestricted File Upload

Published 2021-10-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Flatcore Flatcore-Cms
Flatcore Flatcore/flatcore-Cms — versions unspecified

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

huntr.dev/bounties/7879ab3d-8018-402a-aa0b-131bdbd1966c (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/flatcore/flatcore-cms/commit/5cc3937b6bc38293ec921a5cf00018b48b668dc6 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3745?: CVE-2021-3745 is a medium-severity vulnerability in Flatcore Flatcore-Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.6/10. Published 2021-10-28.
How severe is CVE-2021-3745?: Medium severity. CVSS v3 base score is 6.6 out of 10.