What is CVE-2018-17556?

CVE-2018-17556 is a medium-severity vulnerability in Modx Revolution, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-09-26.

How severe is CVE-2018-17556?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Modx Revolution

CVE-2018-17556

MODX Revolution v2.6.5-pl allows stored XSS via a Create New Media Source action.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-09-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Modx Revolution — versions 2.6.5

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/modxcms/revolution/issues/14094 (Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-17556?: CVE-2018-17556 is a medium-severity vulnerability in Modx Revolution, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-09-26.
How severe is CVE-2018-17556?: Medium severity. CVSS v3 base score is 5.4 out of 10.