What is CVE-2017-18388?

CVE-2017-18388 is a high-severity vulnerability in Cpanel, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2019-08-02.

How severe is CVE-2017-18388?

High severity. CVSS v3 base score is 7.8 out of 10.

Improper input validation in Cpanel

CVE-2017-18388

cPanel before 68.0.15 can perform unsafe file operations because Jailshell does not set the umask (SEC-315).

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

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

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (32.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · 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-2017-18388?: CVE-2017-18388 is a high-severity vulnerability in Cpanel, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2019-08-02.
How severe is CVE-2017-18388?: High severity. CVSS v3 base score is 7.8 out of 10.