What is CVE-2018-20898?

CVE-2018-20898 is a medium-severity vulnerability in Cpanel, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.3/10. Published 2019-08-01.

How severe is CVE-2018-20898?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Cpanel

CVE-2018-20898

cPanel before 71.9980.37 allows e-mail injection during cPAddons moderation (SEC-396).

Published 2019-08-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.3% 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

Cpanel

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

documentation.cpanel.net/display/CL/72+Change+Log (Product, Release Notes)
news.cpanel.com/cpanel-tsr-2018-0003-full-disclosure/ (Vendor Advisory)

Frequently asked questions

What is CVE-2018-20898?: CVE-2018-20898 is a medium-severity vulnerability in Cpanel, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.3/10. Published 2019-08-01.
How severe is CVE-2018-20898?: Medium severity. CVSS v3 base score is 4.3 out of 10.