What is CVE-2018-20757?

CVE-2018-20757 is a medium-severity vulnerability in Modx Revolution, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-02-06.

How severe is CVE-2018-20757?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Modx Revolution

CVE-2018-20757

MODX Revolution through v2.7.0-pl allows XSS via an extended user field such as Container name or Attribute name.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-02-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (56.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.8% 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

Modx Revolution — versions 2.7.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/modxcms/revolution/issues/14104 (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-20757?: CVE-2018-20757 is a medium-severity vulnerability in Modx Revolution, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-02-06.
How severe is CVE-2018-20757?: Medium severity. CVSS v3 base score is 6.1 out of 10.