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CVE-2026-41940

WebPros cPanel and WHM Authentication Bypass via Login Flow

  • Critical 9.8
  • Exploited: added to CISA KEV 30 Apr 2026
  • Used in ransomware campaigns

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.

Key facts

Published
29 Apr 2026
Last changed
30 Sep 2026
Assigned by
VulnCheck
KEV added
30 Apr 2026
KEV fix due
3 May 2026
Used in ransomware
Yes, according to CISA
EPSS
98.527% likely to be exploited in the next 30 days, higher than 99.922% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.3CVSS 4.0, Criticalfrom the CNA (VulnCheck)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
  • 9.8CVSS 3.1, Criticalfrom the CNA (VulnCheck)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

  • Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
WebProscPanel
  • Default status: affected
  • 11.40.0.0 up to but excluding 11.86.0.41 (affected)
  • 11.88.0.0 up to but excluding 11.94.0.28 (affected)
  • 11.96.0.0 up to but excluding 11.102.0.39 (affected)
  • 11.104.0.0 up to but excluding 11.110.0.97 (affected)
  • 11.112.0.0 up to but excluding 11.118.0.63 (affected)
  • 11.120.0.0 up to but excluding 11.124.0.35 (affected)
  • 11.126.0.0 up to but excluding 11.126.0.54 (affected)
  • 11.128.0.0 up to but excluding 11.130.0.19 (affected)
  • 11.132.0.0 up to but excluding 11.132.0.29 (affected)
  • 11.134.0.0 up to but excluding 11.134.0.20 (affected)
  • 11.136.0.0 up to but excluding 11.136.0.5 (affected)
WebProsWP Squared
  • Default status: unaffected
  • 0 up to but excluding 11.136.1.7 (affected)
WebProsWHM
  • Default status: affected
  • 11.40.0.0 up to but excluding 11.86.0.41 (affected)
  • 11.88.0.0 up to but excluding 11.94.0.28 (affected)
  • 11.96.0.0 up to but excluding 11.102.0.39 (affected)
  • 11.104.0.0 up to but excluding 11.110.0.97 (affected)
  • 11.112.0.0 up to but excluding 11.118.0.63 (affected)
  • 11.120.0.0 up to but excluding 11.124.0.35 (affected)
  • 11.126.0.0 up to but excluding 11.126.0.54 (affected)
  • 11.128.0.0 up to but excluding 11.130.0.19 (affected)
  • 11.132.0.0 up to but excluding 11.132.0.29 (affected)
  • 11.134.0.0 up to but excluding 11.134.0.20 (affected)
  • 11.136.0.0 up to but excluding 11.136.0.5 (affected)

Timeline

  1. 29 Apr 2026 Published
  2. 30 Apr 2026 CVE-2026-41940 added to CISA KEV
  3. 30 Apr 2026 Added to the CISA KEV catalogue

Weakness

References