CVE-2026-41940

WebPros cPanel and WHM Authentication Bypass via Login Flow

Published Apr 29, 2026 CVSS 4.0 · 9.3 Critical EPSS 98.5% KEV · Listed

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.

Affected Products

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

unaffected

Version	Status	Constraints
`0`	affected	< 11.136.1.7

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 Versions

Cpanel

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

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

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

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

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 in the KEV database since April 30, 2026.

Exploit prediction score: 98.5% (98.527% probability within 30 days)

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

May 4, 2026 5:30 PM Added references View changes

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/

Apr 30, 2026 8:00 PM Affected versions updated View changes

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

Apr 30, 2026 6:00 PM Title updated View changes

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

Apr 30, 2026 5:30 PM Added references. Scoring metrics updated View changes

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'}`

Apr 30, 2026 5:15 PM Scoring metrics updated View changes

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

Apr 30, 2026 1:15 AM Description updated View changes

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.

Apr 29, 2026 10:15 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

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

Apr 29, 2026 6:15 PM Added references. Scoring metrics updated View changes

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'}`

Apr 29, 2026 4:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Apr 29, 2026 3:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

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'}`