What is CVE-2018-20339?

CVE-2018-20339 is a medium-severity vulnerability in Zohocorp Manageengine Opmanager, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-21.

How severe is CVE-2018-20339?

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

XSS in Zohocorp Manageengine Opmanager

CVE-2018-20339

Zoho ManageEngine OpManager 12.3 before build 123239 allows XSS in the Notes column of the Alarms section.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-12-21 · 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: 0.024 (83.5th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Zohocorp Manageengine Opmanager — versions 12.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.manageengine.com/network-monitoring/help/read-me.html (Release Notes, Vendor Advisory)
www.securityfocus.com/bid/106302 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-20339?: CVE-2018-20339 is a medium-severity vulnerability in Zohocorp Manageengine Opmanager, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-21.
How severe is CVE-2018-20339?: Medium severity. CVSS v3 base score is 6.1 out of 10.