CVE-2026-41940

9.8 CRITICAL CISA KEV - Actively Exploited
Published: April 29, 2026 Modified: May 04, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://docs.cpanel.net/release-notes/release-notes
Source: disclosure@vulncheck.com
Release Notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617
Source: disclosure@vulncheck.com
Release Notes
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026
Source: disclosure@vulncheck.com
Vendor Advisory
https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026
Source: disclosure@vulncheck.com
Third Party Advisory
https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow
Source: disclosure@vulncheck.com
Third Party Advisory
https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/
Source: af854a3a-2127-422b-91ae-364da2661108
https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/
Source: af854a3a-2127-422b-91ae-364da2661108
https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
US Government Resource

9 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.8 / 10.0
EPSS (Exploit Probability)
28.4%
97th percentile
Exploitation Status
Actively Exploited
Remediation due: 2026-05-03

Weaknesses (CWE)

CWE-306

Affected Vendors

cpanel

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