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Fencer Vulns
critical 9.8

CVE-2026-41940 kev+ ransomware in the critical feed json

WebPros cPanel and WHM Authentication Bypass via Login Flow

published 2026-04-29 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-26246

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2026-04-30, used in ransomware
epss
98.5%
EPSS 98.5% chance of exploitation in 30 days, percentile 99.9%
public exploits
2
Metasploit, Exploit-DB, plus a Nuclei check

Summary

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.

Patch / fix

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

  • WebPros cPanel 11.86.0.41, 11.94.0.28, 11.102.0.39, 11.110.0.97, 11.118.0.63, 11.124.0.35, 11.126.0.54, 11.130.0.19, 11.132.0.29, 11.134.0.20, 11.136.0.5
  • WebPros WP Squared 11.136.1.7
  • WebPros WHM 11.86.0.41, 11.94.0.28, 11.102.0.39, 11.110.0.97, 11.118.0.63, 11.124.0.35, 11.126.0.54, 11.130.0.19, 11.132.0.29, 11.134.0.20, 11.136.0.5

Timeline

  1. First public exploit (Metasploit exploit/multi/http/cpanel_whm_auth_bypass_rce)
  2. CISA SSVC: exploitation active
  3. Published
  4. Added to CISA KEV
  5. CISA patch deadline

Known exploited

Added
6 mo ago
Patch by
2026-05-03 (6 mo ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor, product
WebPros, cPanel & WHM and WP2 (WordPress Squared)
CISA name
WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
6 mo ago

Exploit prediction

98.53% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/multi/http/cpanel_whm_auth_bypass_rce cPanel/WHM CRLF Injection Authentication Bypass RCE metasploit exploit, excellent rank, 2026-04-28
  • EDB-52574 cPanel - CRLF Injection webapps, 2026-05-26
  • Nuclei template cPanel & WHM - Authentication Bypass via Session-File CRLF Injection nuclei detection template
  • github.com https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py referenced PoC, tagged "exploit" by a source, unverified
  • labs.watchtowr.com https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 9.3 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
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 9.3 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • WebPros cPanel
  • WebPros WP Squared
  • WebPros WHM

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.