---
id: CVE-2026-41940
title: >-
  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.
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.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-306
vendor: cpanel
product: cpanel
affected:
  - 'cpanel >= 11.40, < 86.0.41'
  - 'cpanel >= 88.0.0, < 110.0.97'
  - 'cpanel >= 112.0.0, < 118.0.63'
  - 'cpanel >= 120.0.0, < 124.0.35'
  - 'cpanel >= 126.0.1, < 126.0.54'
  - 'cpanel >= 128.0.0, < 130.0.19'
  - 'cpanel >= 132.0.0, < 132.0.29'
  - 'cpanel >= 134.0.0, < 134.0.20'
  - 'cpanel >= 136.0.0, < 136.0.5'
  - 'whm >= 11.40, < 86.0.41'
  - 'whm >= 88.0.0, < 110.0.97'
  - 'whm >= 112.0.0, < 118.0.63'
  - 'whm >= 120.0.0, < 124.0.35'
  - 'whm >= 126.0.1, < 126.0.54'
  - 'whm >= 128.0.0, < 130.0.19'
  - 'whm >= 132.0.0, < 132.0.29'
  - 'whm >= 134.0.0, < 134.0.20'
  - 'whm >= 136.0.0, < 136.0.5'
  - wp_squared < 136.1.7
patched:
  - cpanel 136.0.5
  - whm 136.0.5
  - wp_squared 136.1.7
published: '2026-04-29'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:18:18.563'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-41940'
references:
  - url: 'https://docs.cpanel.net/release-notes/release-notes'
    label: disclosure@vulncheck.com
  - url: 'https://docs.wpsquared.com/changelogs/versions/changelog/#13617'
    label: disclosure@vulncheck.com
  - url: >-
      https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026
    label: disclosure@vulncheck.com
  - url: >-
      https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow
    label: disclosure@vulncheck.com
  - url: >-
      https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
  - cve.org
epss: 0.98527
epssPercentile: 0.9992
kev: true
kevDateAdded: '2026-04-30'
kevDueDate: '2026-05-03'
kevRansomware: true
exploited: true
exploits:
  exploitdb: true
  github: 78
  githubRepos:
    - 'https://github.com/ynsmroztas/cPanelSniper'
    - 'https://github.com/assetnote/cpanel2shell-scanner'
    - 'https://github.com/XsanFlip/poc-cpanel-cve-2026-41940'
  metasploit:
    - exploit/multi/http/cpanel_whm_auth_bypass_rce
  nuclei:
    - CVE-2026-41940
  checkedAt: '2026-09-30T19:21:42.186Z'
exploitAvailable: true
zeroDay: true
ssvc:
  exploitation: active
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-04-29T00:00:00+00:00'
ingestedAt: '2026-09-30T18:17:24.558Z'
---

## Overview

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

- `cpanel >= 11.40, < 86.0.41`
- `cpanel >= 88.0.0, < 110.0.97`
- `cpanel >= 112.0.0, < 118.0.63`
- `cpanel >= 120.0.0, < 124.0.35`
- `cpanel >= 126.0.1, < 126.0.54`
- `cpanel >= 128.0.0, < 130.0.19`
- `cpanel >= 132.0.0, < 132.0.29`
- `cpanel >= 134.0.0, < 134.0.20`
- `cpanel >= 136.0.0, < 136.0.5`
- `whm >= 11.40, < 86.0.41`
- `whm >= 88.0.0, < 110.0.97`
- `whm >= 112.0.0, < 118.0.63`
- `whm >= 120.0.0, < 124.0.35`
- `whm >= 126.0.1, < 126.0.54`
- `whm >= 128.0.0, < 130.0.19`
- `whm >= 132.0.0, < 132.0.29`
- `whm >= 134.0.0, < 134.0.20`
- `whm >= 136.0.0, < 136.0.5`
- `wp_squared < 136.1.7`

## Remediation

Upgrade past the affected range:

- `cpanel 136.0.5`
- `whm 136.0.5`
- `wp_squared 136.1.7`