What is CVE-2023-33386?

CVE-2023-33386 is a critical-severity vulnerability in Marsctf Project, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2023-06-05.

How severe is CVE-2023-33386?

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

Arbitrary file upload in Marsctf Project

CVE-2023-33386

MarsCTF 1.2.1 has an arbitrary file upload vulnerability in the interface for uploading attachments in the background.

Vulnerability class: Unrestricted File Upload

Published 2023-06-05 · 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: 0.010 (61.9th percentile), scored 2026-10-08.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Marsctf Project — versions 1.2.1

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

github.com/b1ackc4t/MarsCTF/blob/V1.2.1/src/main/java/com/b1ackc4t/marsctfserve… (Product)
github.com/b1ackc4t/MarsCTF/issues/10 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-33386?: CVE-2023-33386 is a critical-severity vulnerability in Marsctf Project, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2023-06-05.
How severe is CVE-2023-33386?: Critical severity. CVSS v3 base score is 9.8 out of 10.