Stable Host incident
cPanel/WHM - Access Temporarily Restricted
Stable Host experienced a notice incident on April 28, 2026 affecting Amsterdam, NL and Frankfurt, DE and 1 more component, lasting 5h 14m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Apr 28, 2026, 08:00 PM UTC
cPanel has published a notice of a critical authentication vulnerability affecting supported versions of cPanel & WHM. As a precaution, we have temporarily restricted external access to cPanel and WHM ports 2083 and 2087 at the network edge while cPanel prepares a patch. cPanel identifies this firewall restriction as the current recommended workaround. During this time, customers may be unable to access: • cPanel via TCP/2083 • WHM via TCP/2087 In addition, service (proxy) subdomains may be impacted, including: • cpanel.yourdomain.com • whm.yourdomain.com • webmail.yourdomain.com • webdisk.yourdomain.com These “proxy subdomains” are simply friendly shortcuts that redirect to your server’s login services (like cPanel or webmail) without requiring a port number. Because they ultimately rely on the same underlying access points, they may not function during this restriction. This does not indicate an outage of hosted websites, email delivery, DNS, FTP, or database services. Those services are expected to continue operating normally. We are monitoring cPanel’s patch release and will restore access once the vulnerability has been addressed and we have completed validation. You may read more about this vulnerability here: https://support.cpanel.net/hc/en-us/articles/40073787579671-Critical-Vulnerability-with-cPanel-WHM-Login-Authentication Thank you for your patience while we take this precaution to protect customer environments.
- resolved Apr 29, 2026, 01:14 AM UTC
All our Web Hosting servers have been patched according to cPanel directions. If you have a VPS and you are still facing issues, please contact our support.