What is CVE-2018-16820?

CVE-2018-16820 is a high-severity vulnerability in Monstra, classified under Path Traversal. CVSS score: 7.5/10. Published 2018-09-18.

How severe is CVE-2018-16820?

High severity. CVSS v3 base score is 7.5 out of 10.

Path Traversal in Monstra

CVE-2018-16820

admin/index.php in Monstra CMS 3.0.4 allows arbitrary directory listing via id=filesmanager&path=uploads/.......//./.......//./ requests.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2018-09-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.020 (79.7th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Monstra — versions 3.0.4

Weakness classification (CWE)

CWE-22 — Path Traversal

References

blog.51cto.com/13770310/2173957 (Exploit, Third Party Advisory)
github.com/monstra-cms/monstra/issues/457 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-16820?: CVE-2018-16820 is a high-severity vulnerability in Monstra, classified under Path Traversal. CVSS score: 7.5/10. Published 2018-09-18.
How severe is CVE-2018-16820?: High severity. CVSS v3 base score is 7.5 out of 10.