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18th September 2017

cPanel TSR-2017-0005 Security Update, scheduled 2 years ago

cPanel has released new builds for all public update tiers. These updates provide targeted changes to address security concerns with the cPanel & WHM product. These builds are currently available to all customers via the standard update system. cPanel has rated these updates as having CVSSv3 scores ranging from 2.2 to 7.8. Information on cPanel’s security ratings is available at

All our cPanel & WHM servers are configured to automatically update when new releases are available, so there's no action is required. Your systems will update automatically.


The cPanel Security Team and independent security researchers identified the resolved security issues. There is no reason to believe that these vulnerabilities have been made known to the public. As such, cPanel will only release limited information about the vulnerabilities at this time.

Once sufficient time has passed, allowing cPanel & WHM systems to automatically update to the new versions, cPanel will release additional information about the nature of the security issues. This Targeted Security Release addresses 11 vulnerabilities in cPanel & WHM software versions 66, 64, 62, 60, and 56.

Additional information is scheduled for release on September 19, 2017. For information on cPanel & WHM Versions and the Release Process, read our documentation at:

For the PGP-Signed version of this announcement please see: