CVE-2026-87899

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Privilege Escalation in cPanel Allows Root Access

Publication date: 2026-09-23

Last updated on: 2026-09-24

Assigner: HackerOne

Description

Execution with unnecessary privileges in cPanel allows remote authenticated users to execute arbitrary code with root privileges.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-23

Last Modified

2026-09-24

Generated

2026-10-14

AI Q&A

2026-09-24

EPSS Evaluated

2026-10-13

NVD

CVE-2026-87899

EUVD

EUVD-2026-85622

Affected Vendors & Products

Vendor	Product	Version / Range
cpanel	whm	to 11.134.0.57 (exc)
cpanel	whm	to 11.136.0.41 (exc)
cpanel	whm	to 11.138.0.8 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-250	The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.

Attack-Flow Graph

Executive Summary

This vulnerability in cPanel allows remote authenticated users to execute arbitrary code with root privileges due to unnecessary privileges in the system.

Detection Guidance

To detect this vulnerability, check your cPanel/WHM version against the affected releases. Run 'cat /usr/local/cpanel/version' to verify your version. If your version is below 11.134.0.57, 11.136.0.41, or 11.138.0.8, the system is vulnerable.

Impact Analysis

An attacker with access could gain full control of the server, allowing them to steal data, install malware, or disrupt services. This requires an authenticated cPanel account.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA compliance requirements for data protection and security.

Mitigation Strategies

Immediately update cPanel/WHM to the latest patched versions: 11.134.0.57, 11.136.0.41, 11.138.0.8, or WP2 versions 11.138.1.11. Disable CalDAV/CardDAV services if not needed until patched.

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