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8.8

cPanel webmail can run unauthorized code via forwarders

CVE-2016-10816 · published 7 years ago
Summary

cPanel versions prior to 57.9999.54 let a webmail user create a forwarder that can cause the server to execute any code they choose. This could let an attacker take control of the server or steal data. Update cPanel to the latest version or apply the vendor's security patch as soon as possible.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cpanel cpanel >= 11.50.0.4, < 11.50.6.2
>= 11.52.6.0, < 11.52.6.1
>= 11.54.0.0, < 11.54.0.24
>= 56.0.1, < 56.0.15
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*
Original advisory text
cPanel before 57.9999.54 allows Webmail accounts to execute arbitrary code through forwarders (SEC-121).
cPanel before 57.9999.54 allows Webmail accounts to execute arbitrary code through forwarders (SEC-121).
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
8.8 High
Exploitation
2% chance of attack within 30 days
Type
CWE-20Improper Input Validation
Timeline
Published1 Aug 2019
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2016-10816 · NVD
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