What is CVE-2016-10855?

CVE-2016-10855 is a critical-severity vulnerability in Cpanel, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2019-08-01.

How severe is CVE-2016-10855?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Cpanel

CVE-2016-10855

cPanel before 11.54.0.4 allows unauthenticated arbitrary code execution via cpsrvd (SEC-91).

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

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.026 (84.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

Cpanel

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

documentation.cpanel.net/display/CL/54+Change+Log (Product, Release Notes)
forums.cpanel.net/threads/cpanel-tsr-2016-0001-full-disclosure.522571/ (Vendor Advisory)

Frequently asked questions

What is CVE-2016-10855?: CVE-2016-10855 is a critical-severity vulnerability in Cpanel, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2019-08-01.
How severe is CVE-2016-10855?: Critical severity. CVSS v3 base score is 9.8 out of 10.