What is CVE-2017-18393?

CVE-2017-18393 is a low-severity vulnerability in Cpanel, classified under Improper Input Validation. CVSS score: 2.7/10. Published 2019-08-02.

How severe is CVE-2017-18393?

Low severity. CVSS v3 base score is 2.7 out of 10.

Improper input validation in Cpanel

CVE-2017-18393

cPanel before 68.0.15 does not block a username of postmaster, which might allow reception of private e-mail (SEC-326).

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2019-08-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Cpanel

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

documentation.cpanel.net/display/CL/68+Change+Log (Product, Release Notes)
news.cpanel.com/cpanel-tsr-2017-0006-full-disclosure/ (Vendor Advisory)

Frequently asked questions

What is CVE-2017-18393?: CVE-2017-18393 is a low-severity vulnerability in Cpanel, classified under Improper Input Validation. CVSS score: 2.7/10. Published 2019-08-02.
How severe is CVE-2017-18393?: Low severity. CVSS v3 base score is 2.7 out of 10.