What is CVE-2018-20926?

CVE-2018-20926 is a medium-severity vulnerability in Cpanel, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.7/10. Published 2019-08-01.

How severe is CVE-2018-20926?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Arbitrary file upload in Cpanel

CVE-2018-20926

cPanel before 70.0.23 allows local privilege escalation via the WHM Locale XML Upload interface (SEC-380).

Vulnerability class: Unrestricted File Upload

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

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.1% 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-434 — Unrestricted Upload of File with Dangerous Type

References

documentation.cpanel.net/display/CL/70+Change+Log (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2018-20926?: CVE-2018-20926 is a medium-severity vulnerability in Cpanel, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.7/10. Published 2019-08-01.
How severe is CVE-2018-20926?: Medium severity. CVSS v3 base score is 6.7 out of 10.