What is CVE-2018-18694?

CVE-2018-18694 is a medium-severity vulnerability in Monstra, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-10-29.

How severe is CVE-2018-18694?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Is CVE-2018-18694 known to be exploited?

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

XSS in Monstra

CVE-2018-18694

admin/index.php?id=filesmanager in Monstra CMS 3.0.4 allows remote authenticated administrators to trigger stored XSS via JavaScript content in a file whose name lacks an extension. Such a file is interpreted as text/html in certain cases.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-10-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.9th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Monstra — versions 3.0.4

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/monstra-cms/monstra/issues/459 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-18694?: CVE-2018-18694 is a medium-severity vulnerability in Monstra, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-10-29.
How severe is CVE-2018-18694?: Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2018-18694 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.