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CVE Vulnerability Details :
CVE-2026-41940
PUBLISHED
More InfoOfficial Page
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
View Known Exploited Vulnerability (KEV) details
Published At-29 Apr, 2026 | 15:10
Updated At-06 May, 2026 | 15:48
Rejected At-
▼CVE Numbering Authority (CNA)
WebPros cPanel and WHM Authentication Bypass via Login Flow

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
Vendor
WebPros
Product
cPanel
Default Status
affected
Versions
Affected
  • From 11.40.0.0 before 11.86.0.41 (custom)
  • From 11.88.0.0 before 11.94.0.28 (custom)
  • From 11.96.0.0 before 11.102.0.39 (custom)
  • From 11.104.0.0 before 11.110.0.97 (custom)
  • From 11.112.0.0 before 11.118.0.63 (custom)
  • From 11.120.0.0 before 11.124.0.35 (custom)
  • From 11.126.0.0 before 11.126.0.54 (custom)
  • From 11.128.0.0 before 11.130.0.19 (custom)
  • From 11.132.0.0 before 11.132.0.29 (custom)
  • From 11.134.0.0 before 11.134.0.20 (custom)
  • From 11.136.0.0 before 11.136.0.5 (custom)
Vendor
WebPros
Product
WP Squared
Default Status
affected
Versions
Unaffected
  • 11.136.1.7 (custom)
Vendor
WebPros
Product
WHM
Default Status
affected
Versions
Affected
  • From 11.40.0.0 before 11.86.0.41 (custom)
  • From 11.88.0.0 before 11.94.0.28 (custom)
  • From 11.96.0.0 before 11.102.0.39 (custom)
  • From 11.104.0.0 before 11.110.0.97 (custom)
  • From 11.112.0.0 before 11.118.0.63 (custom)
  • From 11.120.0.0 before 11.124.0.35 (custom)
  • From 11.126.0.0 before 11.126.0.54 (custom)
  • From 11.128.0.0 before 11.130.0.19 (custom)
  • From 11.132.0.0 before 11.132.0.29 (custom)
  • From 11.134.0.0 before 11.134.0.20 (custom)
  • From 11.136.0.0 before 11.136.0.5 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-306CWE-306 Missing Authentication for Critical Function
Type: CWE
CWE ID: CWE-306
Description: CWE-306 Missing Authentication for Critical Function
Metrics
VersionBase scoreBase severityVector
4.09.3CRITICAL
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
3.19.8CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Version: 4.0
Base score: 9.3
Base severity: CRITICAL
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
Version: 3.1
Base score: 9.8
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026
vendor-advisory
patch
https://docs.cpanel.net/release-notes/release-notes
release-notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617
release-notes
https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026
third-party-advisory
https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow
third-party-advisory
Hyperlink: https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026
Resource:
vendor-advisory
patch
Hyperlink: https://docs.cpanel.net/release-notes/release-notes
Resource:
release-notes
Hyperlink: https://docs.wpsquared.com/changelogs/versions/changelog/#13617
Resource:
release-notes
Hyperlink: https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026
Resource:
third-party-advisory
Hyperlink: https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
1. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
kev
dateAdded:
2026-04-30
reference:
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
CVE-2026-41940 added to CISA KEV2026-04-30 00:00:00
Event: CVE-2026-41940 added to CISA KEV
Date: 2026-04-30 00:00:00
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py
exploit
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940
government-resource
Hyperlink: https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py
Resource:
exploit
Hyperlink: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940
Resource:
government-resource
2. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/
N/A
https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/
N/A
Hyperlink: https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/
Resource: N/A
Hyperlink: https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/
Resource: N/A
Details not found