Vulnerability-Lookup

FKIE_CVE-2026-41940

Vulnerability from fkie_nvd - Published: 2026-04-29 16:16 - Updated: 2026-10-26 20:10

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

References

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

Impacted products

Vendor	Product	Version
cpanel	cpanel	*
cpanel	cpanel	*
cpanel	cpanel	*
cpanel	cpanel	*
cpanel	cpanel	*
cpanel	cpanel	*
cpanel	cpanel	*
cpanel	cpanel	*
cpanel	cpanel	*
cpanel	whm	*
cpanel	whm	*
cpanel	whm	*
cpanel	whm	*
cpanel	whm	*
cpanel	whm	*
cpanel	whm	*
cpanel	whm	*
cpanel	whm	*
cpanel	wp_squared	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "affected",
          "product": "cPanel",
          "vendor": "WebPros",
          "versions": [
            {
              "lessThan": "11.86.0.41",
              "status": "affected",
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              "versionType": "custom"
            },
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              "lessThan": "11.94.0.28",
              "status": "affected",
              "version": "11.88.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "11.102.0.39",
              "status": "affected",
              "version": "11.96.0.0",
              "versionType": "custom"
            },
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              "status": "affected",
              "version": "11.112.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "11.124.0.35",
              "status": "affected",
              "version": "11.120.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "11.126.0.54",
              "status": "affected",
              "version": "11.126.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "11.130.0.19",
              "status": "affected",
              "version": "11.128.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "11.132.0.29",
              "status": "affected",
              "version": "11.132.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "11.134.0.20",
              "status": "affected",
              "version": "11.134.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "11.136.0.5",
              "status": "affected",
              "version": "11.136.0.0",
              "versionType": "custom"
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          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WP Squared",
          "vendor": "WebPros",
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            },
            {
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              "versionType": "custom"
            },
            {
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              "versionType": "custom"
            },
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            },
            {
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              "versionType": "custom"
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          ]
        }
      ],
      "source": "disclosure@vulncheck.com"
    }
  ],
  "cisaActionDue": "2026-05-03",
  "cisaExploitAdd": "2026-04-30",
  "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
  "cisaVulnerabilityName": "WebPros cPanel \u0026 WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
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          ],
          "negate": false,
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      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Las versiones de cPanel y WHM posteriores a la 11.40 contienen una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n en el flujo de inicio de sesi\u00f3n que permite a atacantes remotos no autenticados obtener acceso no autorizado al panel de control."
    }
  ],
  "id": "CVE-2026-41940",
  "lastModified": "2026-10-26T20:10:00.160",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-41940",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-29T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-29T16:16:25.037",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://docs.cpanel.net/release-notes/release-notes"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://docs.wpsquared.com/changelogs/versions/changelog/#13617"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow"
    },
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      "url": "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",
      "tags": [
        "Press/Media Coverage"
      ],
      "url": "https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-04-29 15:10 – Updated: 2026-09-30 17:20

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-04-29 00:00 UTC

CWE

CWE-306 - Missing Authentication for Critical Function

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7416 records in the last 180 days details

References

9 references

URL	Tags
https://support.cpanel.net/hc/en-us/articles/4007…	vendor-advisorypatch
https://docs.cpanel.net/release-notes/release-notes	release-notes
https://docs.wpsquared.com/changelogs/versions/ch…	release-notes
https://www.namecheap.com/status-updates/ongoing-…	third-party-advisory
https://www.vulncheck.com/advisories/cpanel-and-w…	third-party-advisory
https://github.com/watchtowrlabs/watchTowr-vs-cPa…	exploit
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource
https://www.bleepingcomputer.com/news/security/cr…
https://labs.watchtowr.com/the-internet-is-fallin…

Impacted products

3 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)
WebPros	WP Squared	Affected: 0 , < 11.136.1.7 (custom)
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)

Date Public

2026-04-28 00:00

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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.

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