CVE-2026-41940 (GCVE-0-2026-41940)

Vulnerability from cvelistv5 – Published: 2026-04-29 15:10 – Updated: 2026-05-06 15:48
VLAI CISA ENISA KEVIntel
Title
WebPros cPanel and WHM Authentication Bypass via Login Flow
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
9.3 (Critical)
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
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
References
Impacted products
Vendor Product Version
WebPros cPanel Affected: 11.40.0.0 , < 11.86.0.41 (custom)
Affected: 11.88.0.0 , < 11.94.0.28 (custom)
Affected: 11.96.0.0 , < 11.102.0.39 (custom)
Affected: 11.104.0.0 , < 11.110.0.97 (custom)
Affected: 11.112.0.0 , < 11.118.0.63 (custom)
Affected: 11.120.0.0 , < 11.124.0.35 (custom)
Affected: 11.126.0.0 , < 11.126.0.54 (custom)
Affected: 11.128.0.0 , < 11.130.0.19 (custom)
Affected: 11.132.0.0 , < 11.132.0.29 (custom)
Affected: 11.134.0.0 , < 11.134.0.20 (custom)
Affected: 11.136.0.0 , < 11.136.0.5 (custom)
Create a notification for this product.
WebPros WP Squared Unaffected: 11.136.1.7 (custom)
Create a notification for this product.
WebPros WHM Affected: 11.40.0.0 , < 11.86.0.41 (custom)
Affected: 11.88.0.0 , < 11.94.0.28 (custom)
Affected: 11.96.0.0 , < 11.102.0.39 (custom)
Affected: 11.104.0.0 , < 11.110.0.97 (custom)
Affected: 11.112.0.0 , < 11.118.0.63 (custom)
Affected: 11.120.0.0 , < 11.124.0.35 (custom)
Affected: 11.126.0.0 , < 11.126.0.54 (custom)
Affected: 11.128.0.0 , < 11.130.0.19 (custom)
Affected: 11.132.0.0 , < 11.132.0.29 (custom)
Affected: 11.134.0.0 , < 11.134.0.20 (custom)
Affected: 11.136.0.0 , < 11.136.0.5 (custom)
Create a notification for this product.
Date Public
2026-04-28 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1b96b1d8-cbda-4ec5-8e2d-dc802510aea3

Vulnerability ID: CVE-2026-41940

Status: Confirmed

Status Updated: 2026-04-30 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-04-30
Asserted: 2026-04-30
Scope
Notes: KEV entry: WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability | Affected: WebPros / cPanel & WHM and WP2 (WordPress Squared) | Description: WebPros cPanel & WHM (WebHost Manager) and WP2 (WordPress Squared) contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel. | 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. | Due date: 2026-05-03 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 ; https://docs.cpanel.net/release-notes/release-notes/ ; https://docs.wpsquared.com/changelogs/versions/changelog/#13617 ; https://nvd.nist.gov/vuln/detail/CVE-2026-41940"
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-306
Feed CISA Known Exploited Vulnerabilities Catalog
Product cPanel & WHM and WP2 (WordPress Squared)
Due Date 2026-05-03
Date Added 2026-04-30
Vendorproject WebPros
Vulnerabilityname WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-04-30 17:00 UTC | Updated: 2026-04-30 17:00 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4a77ab60-22dd-424e-9c24-a063b1a9e64b

Vulnerability ID: CVE-2026-41940

Status: Confirmed

Status Updated: 2026-05-08 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-05-08
Asserted: 2026-05-08
Scope
Notes: Affected: WebPros / cPanel | 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. | Exploitation type: ransomware | CWEs: CWE-306 | Origin source: CERT-PL | Notes: https://support.cpanel.net/hc/en-us/articles/40073787579671-Security-CVE-2026-41940-cPanel-WHM-WP2-Security-Update-04-28-2026
Evidence

Type: Csirt Report

Signal: Confirmed Compromise

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes CWE-306
Euvd EUVD-2026-26246
Notes https://support.cpanel.net/hc/en-us/articles/40073787579671-Security-CVE-2026-41940-cPanel-WHM-WP2-Security-Update-04-28-2026
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product cPanel
Datereported 2026/05/08
Originsource CERT-PL
Vendorproject WebPros
Exploitationtype ransomware
Vulnerabilityname
Threatactorsexploiting -
References
Created: 2026-05-21 09:00 UTC | Updated: 2026-05-21 09:00 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8f356133-327f-472c-adf6-63605f152c6d

Vulnerability ID: CVE-2026-41940

Status: Confirmed

Status Updated: 2026-06-01 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: WebPros cPanel and WHM Authentication Bypass via Login Flow | Affected: WebPros / cPanel, WP Squared, WHM | CVSS: 9.3 (CRITICAL) | EPSS: 0.90543 | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title WebPros cPanel and WHM Authentication Bypass via Login Flow
Vendor WebPros
Product cPanel, WP Squared, WHM
Added Date 2026-06-01T00:00:00.000Z
Cvss Score 9.3
Epss Score 0.90543
Cvss Severity CRITICAL
Epss Percentile 0.99789
Used In Malware yes
Ahead Of Cisa Kev 
{
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  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website
To clipboard 

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      "cveMetadata": "{\"cveId\": \"CVE-2026-41940\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-06T15:48:18.270Z\", \"dateReserved\": \"2026-04-22T18:50:43.621Z\", \"assignerOrgId\": \"83251b91-4cc7-4094-a5c7-464a1b83ea10\", \"datePublished\": \"2026-04-29T15:10:37.899Z\", \"assignerShortName\": \"VulnCheck\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.