What is CVE-2018-17418?

CVE-2018-17418 is a high-severity vulnerability in Monstra, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2019-03-07.

How severe is CVE-2018-17418?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2018-17418 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Monstra

CVE-2018-17418

Monstra CMS 3.0.4 allows remote attackers to execute arbitrary PHP code via a mixed-case file extension, as demonstrated by the 123.PhP filename, because plugins\box\filesmanager\filesmanager.admin.php mishandles the forbidden_types variable.

Vulnerability class: Unrestricted File Upload

Published 2019-03-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.031 (87.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Monstra — versions 3.0.4

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

github.com/AlwaysHereFight/monstra_cms-3.0.4--getshell/blob/master/README.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-17418?: CVE-2018-17418 is a high-severity vulnerability in Monstra, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2019-03-07.
How severe is CVE-2018-17418?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2018-17418 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.