Security Advisory: cPanel Mail Sending API Server-Side Request Forgery

The Mail Sending API allowed a reseller account to issue server-side requests to internal network endpoints, enabling internal port scanning and metadata access.

Medium 2026-05-19

cPanel AlmaLinux 8 AlmaLinux 9 CentOS 7 CloudLinux 8 CloudLinux 9

Affected Versions

cPanel & WHM 120.0.3 and earlier

Patched Version

cPanel & WHM 120.0.6

Default Update CMD

yum update -y

Fix Commands

AlmaLinux 9 / CloudLinux 9

dnf clean metadata
/scripts/upcp --force

AlmaLinux 8 / CloudLinux 8

dnf clean metadata
/scripts/upcp --force

CentOS 7 / CloudLinux 7

yum clean all
/scripts/upcp --force

References

Vendor Advisory

Security Advisories

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