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cPanel CVE-2026-68490: Local Information Disclosure (CalDAV/CardDAV)

cPanel is affected by CVE-2026-68490. Incorrect permission assignment allows local users to obtain sensitive CalDAV/CardDAV information belonging to other accounts. Affected versions: 11.120.0.0 before 11.134.0.57 | 11.136.0.0 before 11.136.0.41 | 11.138.0.0 before 11.138.0.8. Fixed in 11.134.0.57 / 11.136.0.41 / 11.138.0.8 / WP Squared 11.138.1.11.

High 8.2 CVSS
cPanel AlmaLinux 8 AlmaLinux 9 CentOS 7 CloudLinux 7 CloudLinux 8 CloudLinux 9

Affected Versions

11.120.0.0 before 11.134.0.57 | 11.136.0.0 before 11.136.0.41 | 11.138.0.0 before 11.138.0.8

Patched Version

11.134.0.57 / 11.136.0.41 / 11.138.0.8

Default Update CMD

/usr/local/cpanel/scripts/upcp --force

Fix Commands

AlmaLinux / CloudLinux / RHEL / Rocky Linux

# cPanel updates automatically; run manually to patch now
/usr/local/cpanel/scripts/upcp --force
# The update also repairs calendar and contact permissions for existing accounts
cat /usr/local/cpanel/version

What this means under a SharedLicense license

Your SharedLicense cPanel license itself is not affected — this is a vulnerability in cPanel & WHM, not in licensing. Licenses continue to work during and after the update; there is no need to re-issue or re-activate anything. If you resell under your own brand, patch client servers too — unpatched installs put your reputation at risk, not your license.

Incorrect permission assignment allows local users to obtain sensitive CalDAV/CardDAV information belonging to other accounts. The information exposed includes calendar events and contacts of other accounts on the server.

Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-68490

Frequently Asked Questions

What is CVE-2026-68490?
Incorrect permission assignment allows local users to obtain sensitive CalDAV/CardDAV information belonging to other accounts. Affected versions: 11.120.0.0 before 11.134.0.57 | 11.136.0.0 before 11.136.0.41 | 11.138.0.0 before 11.138.0.8. Fixed in 11.134.0.57 / 11.136.0.41 / 11.138.0.8 / WP Squared 11.138.1.11.
Is CVE-2026-68490 being exploited in the wild?
No confirmed public exploitation has been announced at the time of writing. Apply the update on your next maintenance window and watch the vendor advisory for changes.
How do I fix CVE-2026-68490?
cPanel updates automatically; run manually to patch now. /usr/local/cpanel/scripts/upcp --force. The update also repairs calendar and contact permissions for existing accounts. cat /usr/local/cpanel/version.
Which versions are affected?
Affected: 11.120.0.0 before 11.134.0.57 | 11.136.0.0 before 11.136.0.41 | 11.138.0.0 before 11.138.0.8. Update to 11.134.0.57 / 11.136.0.41 / 11.138.0.8 / WP Squared 11.138.1.11 or later.

References

Security Advisories

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