Dear Clients,

We would like to inform you of an important security update released by cPanel for cPanel & WHM on April 28, 2026.

This update addresses a security vulnerability affecting multiple authentication paths across all supported versions. Our team has reviewed the release and confirms that it is fully compatible with the Authify licensing system. We strongly recommend applying this update at the earliest opportunity to maintain system security and stability.

Step 1: Verify Your Current Version

Before proceeding with any upgrade, please confirm your current installed version by running the following command as root:

/scripts/updatenow 2>/dev/null | grep -E "Running version|Detected version"

Example output:

[2026-04-28 08:54:21 +0600]   Running version '11.120.0.22' of updatenow.
[2026-04-28 08:54:21 +0600]   Detected version '11.120.0.22' from version file.

Important Notes:

  • Systems running 11.120.x.x may be upgraded to newer builds such as 11.136.x.x.

  • Versions such as 11.110.x.x are limited to CentOS 7 and should not be upgraded beyond their supported operating system constraints.

Step 2: Define Target Version

For controlled upgrades, you may manually define the desired cPanel version:

chattr -ia /etc/cpupdate.conf /usr/local/cpanel/version
VERSION=11.120.0.16   # Replace with your detected or desired version
sed -i "s/^CPANEL=.*/CPANEL=$VERSION/g" /etc/cpupdate.conf
echo "$VERSION" > /usr/local/cpanel/version

Please replace 11.120.0.16 with:

  • Your current detected version (to maintain stability), or

  • Your intended target version (e.g., 11.136.x.x) for upgrade.

Patched Versions

The following versions include the required security fixes:

  • 11.110.0.97

  • 11.118.0.63

  • 11.126.0.54

  • 11.132.0.29

  • 11.134.0.20

  • 11.136.0.5

Final Recommendations

  • Always verify your current version before performing an upgrade

  • Ensure operating system compatibility, particularly for CentOS 7 environments

  • Upgrade only to one of the patched and supported versions listed above

If you require any assistance, please do not hesitate to contact our support team.

Thank you.



Tuesday, April 28, 2026

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