What is CVE-2018-16637?

CVE-2018-16637 is a medium-severity vulnerability in Modx Evolution Cms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-12-28.

How severe is CVE-2018-16637?

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

Is CVE-2018-16637 known to be exploited?

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

XSS in Modx Evolution Cms

CVE-2018-16637

Evolution CMS 1.4.x allows XSS via the page weblink title parameter to the manager/ URI.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-12-28 · 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 (45.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% 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 Evolution Cms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

0xT11/CVE-POC

References

github.com/security-breachlock/CVE-2018-16637/blob/master/evolution_xss_stored… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-16637?: CVE-2018-16637 is a medium-severity vulnerability in Modx Evolution Cms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-12-28.
How severe is CVE-2018-16637?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2018-16637 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.