🛡️ AI Security Tool Module
CVE-2026-41940: cPanel & WHM Unauthenticated Root RCE (CRLF Session Injection)

Official Security Audit & Exploitation Module for AI Security Tool Ecosystem

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🧠 Conceptual Overview

This module delivers comprehensive diagnostic tools and technical assessment routines for CVE-2026-41940, a critical unauthenticated authentication bypass vulnerability in cPanel & WHM (CVSS 10.0). By leveraging improper CRLF sequence handling within the HTTP Authorization header parser during premature session initialization, an attacker can manipulate server-side session files and achieve full root-level WHM authorization without valid credentials.

🎯 Core Impact Philosophy

"Control the session, own the host."
Because WHM interfaces operate directly under administrative privileges, authentication bypass vectors on management ports (2083/2087) represent immediate full-compromise risks across Web Host Manager installations.

📊 Vulnerability Specifications

Specification	Assigned Value	Notes
CVE Identifier	CVE-2026-41940	cPanel & WHM Session Header Injection Bypass
Severity Rating	Critical (CVSS v3.1: 10.0)	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Vulnerability Type	CWE-113 / CWE-287	CRLF Injection & Authentication Bypass
Affected Component	cPanel & WHM Session Daemon (cpsrvd)	HTTP Authorization header parsing engine
Attack Vector	Network (TCP 2083 / 2087)	Unauthenticated crafted HTTP authorization request
Privileges Required	None	Zero user authentication or interaction required

🕸 Attack Scenario & Architecture

graph TD
    A[Unauthenticated Attacker] -->|Crafted Authorization Header with CRLF| B[cPanel / WHM Service]
    B -->|Premature Session File Generation| C[Inject Parameters into Session Data]
    C -->|Bypass Credential Validation| D[Grant Elevated WHM Administrative Token]
    D -->|Post-Exploitation Actions| E[Full System Root Compromise]
  

📋 Affected Versions Table

Branch	Vulnerable Version Range	Patched Version
110.x	≤ 11.110.0.96	11.110.0.97
118.x	≤ 11.118.0.62	11.118.0.63
126.x	≤ 11.126.0.53	11.126.0.54
132.x	≤ 11.132.0.28	11.132.0.29
134.x	≤ 11.134.0.19	11.134.0.20
136.x	≤ 11.136.0.4	11.136.0.5

🛡 Threat Hunting & Detection Queries

Splunk Enterprise Query:

index=cpanel sourcetype=cpanel_access_log 
| rex field=_raw "(?i)authorization:\s*(?[^\r\n]+)"
| where match(auth_header, "[\r\n]") OR match(auth_header, "%0D%0A")
| stats count by clientip, http_user_agent, uri_path, auth_header
| sort - count

Microsoft Sentinel Query:

CommonSecurityLog
| where DeviceVendor =~ "cPanel" or DeviceProduct has "WHM"
| where AdditionalExtensions has "Authorization"
| where AdditionalExtensions matches regex "(\r\n|\n|\r|%0D%0A)"
| summarize EventCount = count(), IPs = make_set(SourceIP, 10) by bin(TimeGenerated, 5m), DeviceName
| where EventCount > 0

🛡 Mitigation Checklist

• 🟢 Deploy Security Patches: Immediately upgrade cPanel & WHM instances to versions 11.110.0.97+, 11.118.0.63+, 11.126.0.54+, 11.132.0.29+, 11.134.0.20+, or 11.136.0.5+.
• 🟢 Header Sanitization: Ensure perimeter proxies strip control characters (\r, \n) from all inbound authorization headers.
• 🟡 IP Restrictions: Restrict management ports (2086/2087) to authorized administrative networks.

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