cPanel and WHM versions after 11.40 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact total

Affected Vendors & Products

Vendors Products
Cpanel
  • Cpanel
  • Whm
  • Wp Squared

No data.

No data.

References
Link Providers
https://docs.cpanel.net/release-notes/release-notes cve-icon cve-icon
https://docs.wpsquared.com/changelogs/versions/changelog/#13617 cve-icon cve-icon
https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py cve-icon cve-icon
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 cve-icon cve-icon
https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026 cve-icon cve-icon
https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow cve-icon cve-icon
History

Thu, 30 Apr 2026 01:15:00 +0000

Type Values Removed Values Added
Description cPanel and WHM versions prior to 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.134.0.20, and 11.136.0.5 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel. cPanel and WHM versions after 11.40 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.

Wed, 29 Apr 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Cpanel
Cpanel cpanel
Cpanel whm
Cpanel wp Squared
CPEs cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:wp_squared:*:*:*:*:*:*:*:*
Vendors & Products Cpanel
Cpanel cpanel
Cpanel whm
Cpanel wp Squared

Wed, 29 Apr 2026 18:15:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 29 Apr 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 29 Apr 2026 15:30:00 +0000

Type Values Removed Values Added
Description cPanel and WHM versions prior to 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.134.0.20, and 11.136.0.5 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.
Title cPanel and WHM Authentication Bypass via Login Flow
Weaknesses CWE-306
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-04-29T15:10:37.899Z

Updated: 2026-04-30T01:03:06.606Z

Reserved: 2026-04-22T18:50:43.621Z

Link: CVE-2026-41940

cve-icon Vulnrichment

Updated: 2026-04-29T15:34:02.425Z

cve-icon NVD

Status : Received

Published: 2026-04-29T16:16:25.037

Modified: 2026-04-29T19:16:23.930

Link: CVE-2026-41940

cve-icon Redhat

No data.