What is CVE-2018-16636?

CVE-2018-16636 is a medium-severity vulnerability in Nucleuscms Nucleus Cms, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2018-12-10.

How severe is CVE-2018-16636?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2018-16636 known to be exploited?

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

XSS in Nucleuscms Nucleus Cms

CVE-2018-16636

Nucleus CMS 3.70 allows HTML Injection via the index.php body parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-12-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Nucleuscms Nucleus Cms — versions 3.70

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

0xT11/CVE-POC

References

github.com/NucleusCMS/NucleusCMS/issues/84 (Exploit, Third Party Advisory, Issue Tracking)
github.com/security-breachlock/CVE-2018-16636/blob/master/nucleus_html.pdf (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-16636?: CVE-2018-16636 is a medium-severity vulnerability in Nucleuscms Nucleus Cms, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2018-12-10.
How severe is CVE-2018-16636?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2018-16636 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.