What is CVE-2020-18084?

CVE-2020-18084 is a medium-severity vulnerability in Yzmcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-30.

How severe is CVE-2020-18084?

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

Is CVE-2020-18084 known to be exploited?

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

XSS in Yzmcms

CVE-2020-18084

Cross Site Scripting (XSS) in yzmCMS v5.2 allows remote attackers to execute arbitrary code by injecting commands into the "referer" field of a POST request to the component "/member/index/login.html" when logging in.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.7th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Yzmcms — versions 5.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/yzmcms/yzmcms/issues/9 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-18084?: CVE-2020-18084 is a medium-severity vulnerability in Yzmcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-30.
How severe is CVE-2020-18084?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-18084 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.