What is CVE-2017-18389?

CVE-2017-18389 is a medium-severity vulnerability in Cpanel, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2019-08-02.

How severe is CVE-2017-18389?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Cpanel

CVE-2017-18389

cPanel before 68.0.15 allows string format injection in dovecot-xaps-plugin (SEC-318).

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

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.007 (51.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.8% 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-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

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-2017-18389?: CVE-2017-18389 is a medium-severity vulnerability in Cpanel, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2019-08-02.
How severe is CVE-2017-18389?: Medium severity. CVSS v3 base score is 6.3 out of 10.