CRITICAL KEV Used in ransomware campaigns ⚠
WebPros cPanel and WHM Authentication Bypass via Login Flow
Published Apr 29, 2026 ·Due May 3, 2026
9.3
CRITICALCVSS 4.0
EPSS 98.53%
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.
Affected products
-
- Version 11.104.0.0StatusaffectedConstraints<11.110.0.97
- Version 11.112.0.0StatusaffectedConstraints<11.118.0.63
- Version 11.120.0.0StatusaffectedConstraints<11.124.0.35
- Version 11.126.0.0StatusaffectedConstraints<11.126.0.54
- Version 11.128.0.0StatusaffectedConstraints<11.130.0.19
- Version 11.132.0.0StatusaffectedConstraints<11.132.0.29
- Version 11.134.0.0StatusaffectedConstraints<11.134.0.20
- Version 11.136.0.0StatusaffectedConstraints<11.136.0.5
- Version 11.40.0.0StatusaffectedConstraints<11.86.0.41
- Version 11.88.0.0StatusaffectedConstraints<11.94.0.28
- Version 11.96.0.0StatusaffectedConstraints<11.102.0.39
- Version
-
- Version 11.104.0.0StatusaffectedConstraints<11.110.0.97
- Version 11.112.0.0StatusaffectedConstraints<11.118.0.63
- Version 11.120.0.0StatusaffectedConstraints<11.124.0.35
- Version 11.126.0.0StatusaffectedConstraints<11.126.0.54
- Version 11.128.0.0StatusaffectedConstraints<11.130.0.19
- Version 11.132.0.0StatusaffectedConstraints<11.132.0.29
- Version 11.134.0.0StatusaffectedConstraints<11.134.0.20
- Version 11.136.0.0StatusaffectedConstraints<11.136.0.5
- Version 11.40.0.0StatusaffectedConstraints<11.86.0.41
- Version 11.88.0.0StatusaffectedConstraints<11.94.0.28
- Version 11.96.0.0StatusaffectedConstraints<11.102.0.39
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WebPros | WHM | affected |
| ||||||||||||||||||||||||||||||||||||
| WebPros | cPanel | affected |
|
Configuration 1
OR
- ≥ 11.40 · < 86.0.41
- ≥ 88.0.0 · < 110.0.97
- ≥ 112.0.0 · < 118.0.63
- ≥ 120.0.0 · < 124.0.35
- ≥ 126.0.1 · < 126.0.54
- ≥ 128.0.0 · < 130.0.19
- ≥ 132.0.0 · < 132.0.29
- ≥ 134.0.0 · < 134.0.20
- ≥ 136.0.0 · < 136.0.5
Configuration 2
OR
- ≥ 11.40 · < 86.0.41
- ≥ 88.0.0 · < 110.0.97
- ≥ 112.0.0 · < 118.0.63
- ≥ 120.0.0 · < 124.0.35
- ≥ 126.0.1 · < 126.0.54
- ≥ 128.0.0 · < 130.0.19
- ≥ 132.0.0 · < 132.0.29
- ≥ 134.0.0 · < 134.0.20
- ≥ 136.0.0 · < 136.0.5
Configuration 3
- < 136.1.7
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
9.3 CRITICAL CVE.org
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
Attack Vector Network
Attack Complexity Low
Attack Requirements None
Privileges Required None
User Interaction None
Vulnerable System Confidentiality High
Vulnerable System Integrity High
Vulnerable System Availability High
Subsequent System Confidentiality None
Subsequent System Integrity None
Subsequent System Availability None
1 other source (NVD) ▾
9.3 CRITICAL NVD
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
Attack Vector Network
Attack Complexity Low
Attack Requirements None
Privileges Required None
User Interaction None
Vulnerable System Confidentiality High
Vulnerable System Integrity High
Vulnerable System Availability High
Subsequent System Confidentiality None
Subsequent System Integrity None
Subsequent System Availability None
Exploit Maturity n/a
Confidentiality Requirement n/a
Integrity Requirement n/a
Availability Requirement n/a
Scope n/a
9.8 CRITICAL CVE.org
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
Listed in CISA KEV KEV Used in ransomware campaigns ⚠
Date Added
Apr 30, 2026
Patch Due
May 3, 2026
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.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Apr 30, 2026 · SSVC 2.0.3
98.53% 0.98527
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.98527
Score over time
Apr–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 98.53% (0.98527) | 99.92th | v5 (v2026.06.15) |
| Jul 27, 2026 | 97.93% (0.97927) | 99.90th | v5 (v2026.06.15) |
| Jul 24, 2026 | 96.46% (0.96459) | 99.88th | v5 (v2026.06.15) |
| Jun 23, 2026 | 98.10% (0.98100) | 99.90th | v5 (v2026.06.15) |
| Jun 15, 2026 | 90.54% (0.90543) | 99.79th | v5 (v2026.06.15) |
| May 27, 2026 | 90.53% (0.90530) | 99.63th | v4 (v2025.03.14) |
| May 22, 2026 | 84.37% (0.84371) | 99.33th | v4 (v2025.03.14) |
| May 19, 2026 | 87.83% (0.87829) | 99.48th | v4 (v2025.03.14) |
| May 17, 2026 | 78.29% (0.78293) | 99.04th | v4 (v2025.03.14) |
| May 13, 2026 | 74.24% (0.74239) | 98.86th | v4 (v2025.03.14) |
| May 10, 2026 | 67.01% (0.67014) | 98.57th | v4 (v2025.03.14) |
| May 7, 2026 | 64.28% (0.64284) | 98.46th | v4 (v2025.03.14) |
| May 5, 2026 | 26.55% (0.26552) | 96.36th | v4 (v2025.03.14) |
| May 1, 2026 | 28.36% (0.28361) | 96.53th | v4 (v2025.03.14) |
| Apr 30, 2026 | 16.52% (0.16520) | 94.92th | v4 (v2025.03.14) |
Weaknesses (1)
References (9)
- https://docs.cpanel.net/release-notes/release-notes release-notesRelease Notes
- https://docs.wpsquared.com/changelogs/versions/changelog/#13617 release-notesRelease Notes
- https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py exploitThird Party Advisory
- https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/ ExploitThird Party Advisory
- https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 vendor-advisorypatchVendor Advisory
- https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/ Press/Media Coverage
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940 government-resourceUS Government Resource
- https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026 third-party-advisoryThird Party Advisory
- https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow third-party-advisoryThird Party Advisory
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner VulnCheck
Published Apr 29, 2026
Updated Sep 30, 2026
Reserved Apr 22, 2026
Link CVE-2026-41940
CISA Vulnrichment
Updated Apr 30, 2026