CVE-2026-41940 - Vulnerability Details

- WebPros cPanel and WHM Authentication Bypass via Login Flow

Description

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.

Published: 2026-04-29

Score: 9.3 Critical

EPSS: 74.2% High

KEV: Yes

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

WebPros

cPanel

affected

Version	Status	Constraints
`11.40.0.0`	affected	< 11.86.0.41
`11.88.0.0`	affected	< 11.94.0.28
`11.96.0.0`	affected	< 11.102.0.39
`11.104.0.0`	affected	< 11.110.0.97
`11.112.0.0`	affected	< 11.118.0.63
`11.120.0.0`	affected	< 11.124.0.35
`11.126.0.0`	affected	< 11.126.0.54
`11.128.0.0`	affected	< 11.130.0.19
`11.132.0.0`	affected	< 11.132.0.29
`11.134.0.0`	affected	< 11.134.0.20
`11.136.0.0`	affected	< 11.136.0.5

WebPros

WP Squared

affected

Version	Status	Constraints
`11.136.1.7`	unaffected	—

WebPros

WHM

affected

Version	Status	Constraints
`11.40.0.0`	affected	< 11.86.0.41
`11.88.0.0`	affected	< 11.94.0.28
`11.96.0.0`	affected	< 11.102.0.39
`11.104.0.0`	affected	< 11.110.0.97
`11.112.0.0`	affected	< 11.118.0.63
`11.120.0.0`	affected	< 11.124.0.35
`11.126.0.0`	affected	< 11.126.0.54
`11.128.0.0`	affected	< 11.130.0.19
`11.132.0.0`	affected	< 11.132.0.29
`11.134.0.0`	affected	< 11.134.0.20
`11.136.0.0`	affected	< 11.136.0.5

Configuration 1 [-]

OR	cpe:2.3:a:cpanel:cpanel::::::::
	cpe:2.3:a:cpanel:cpanel::::::::
	cpe:2.3:a:cpanel:cpanel::::::::
	cpe:2.3:a:cpanel:cpanel::::::::
	cpe:2.3:a:cpanel:cpanel::::::::
	cpe:2.3:a:cpanel:cpanel::::::::
	cpe:2.3:a:cpanel:cpanel::::::::
	cpe:2.3:a:cpanel:cpanel::::::::
	cpe:2.3:a:cpanel:cpanel::::::::

Configuration 2 [-]

OR	cpe:2.3:a:cpanel:whm::::::::
	cpe:2.3:a:cpanel:whm::::::::
	cpe:2.3:a:cpanel:whm::::::::
	cpe:2.3:a:cpanel:whm::::::::
	cpe:2.3:a:cpanel:whm::::::::
	cpe:2.3:a:cpanel:whm::::::::
	cpe:2.3:a:cpanel:whm::::::::
	cpe:2.3:a:cpanel:whm::::::::
	cpe:2.3:a:cpanel:whm::::::::

Configuration 3 [-]

cpe:2.3:a:cpanel:wp_squared:*:*:*:*:*:wordpress:*:*

No data.

Vendor Product Confidence Versions

Cpanel

95%

Version	Status	Scheme	Platform
`[11.110.0,11.110.0.97)`	affected	generic	—
`[11.118.0,11.118.0.63)`	affected	generic	—
`[11.126.0,11.126.0.54)`	affected	generic	—
`[11.132.0,11.132.0.29)`	affected	generic	—
`[11.134.0,11.134.0.20)`	affected	generic	—
`[11.136.0,11.136.0.5)`	affected	generic	—

Cpanel

Whm

95%

Version	Status	Scheme	Platform
`[11.110.0,11.110.0.97)`	affected	generic	—
`[11.118.0,11.118.0.63)`	affected	generic	—
`[11.126.0,11.126.0.54)`	affected	generic	—
`[11.132.0,11.132.0.29)`	affected	generic	—
`[11.134.0,11.134.0.20)`	affected	generic	—
`[11.136.0,11.136.0.5)`	affected	generic	—

Cpanel

Wp Squared

100%

Version	Status	Scheme	Platform
`[11.136.1,11.136.1.7)`	affected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

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 in the KEV database since April 30, 2026.

The EPSS score is 0.74239.

Exploitation active

Automatable yes

Technical Impact total

References

Link	Providers
https://docs.cpanel.net/release-notes/release-notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617
https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py
https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026
https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940
https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026
https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow

History

Mon, 04 May 2026 17:30:00 +0000

Type	Values Removed	Values Added
References		https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/ https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/

Thu, 30 Apr 2026 20:00:00 +0000

Type	Values Removed	Values Added
CPEs		cpe:2.3:a:cpanel:wp_squared::::::wordpress::*

Thu, 30 Apr 2026 18:00:00 +0000

Type	Values Removed	Values Added
Title	cPanel and WHM Authentication Bypass via Login Flow	WebPros cPanel and WHM Authentication Bypass via Login Flow

Thu, 30 Apr 2026 17:30:00 +0000

Type	Values Removed	Values Added
References		https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940
Metrics	ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}`	ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Thu, 30 Apr 2026 17:15:00 +0000

Type	Values Removed	Values Added
Metrics		kev `{'dateAdded': '2026-04-30T00:00:00+00:00', 'dueDate': '2026-05-03T00:00:00+00:00'}`

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

Subscriptions

Cpanel Cpanel Whm Wp Squared

MITRE

Status: PUBLISHED

Assigner: VulnCheck

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

Updated: 2026-05-06T15:48:18.270Z

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

Link: CVE-2026-41940

Vulnrichment

Updated: 2026-05-04T16:13:16.841Z

NVD

Status : Analyzed

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

Modified: 2026-05-04T18:09:42.300

Link: CVE-2026-41940

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-05-13T16:00:17Z

Weaknesses

CWE-306

Tracking

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

Exploitation active

Automatable yes

Technical Impact total

Subscriptions

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