What is CVE-2018-20929?

CVE-2018-20929 is a medium-severity vulnerability in Cpanel, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2019-08-01.

How severe is CVE-2018-20929?

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

Open Redirect in Cpanel

CVE-2018-20929

cPanel before 70.0.23 allows an open redirect via the /unprotected/redirect.html endpoint (SEC-392).

Vulnerability class: Open Redirect

Published 2019-08-01 · 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: 0.006 (49.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% 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-601 — URL Redirection to Untrusted Site (Open Redirect)

References

documentation.cpanel.net/display/CL/70+Change+Log (Release Notes, Vendor Advisory)
news.cpanel.com/cpanel-tsr-2018-0002-full-disclosure/ (Vendor Advisory)

Frequently asked questions

What is CVE-2018-20929?: CVE-2018-20929 is a medium-severity vulnerability in Cpanel, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2019-08-01.
How severe is CVE-2018-20929?: Medium severity. CVSS v3 base score is 6.1 out of 10.