cPanel and WHM Authentication Bypass via Login Flow

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-41940",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-04-29T15:34:10.334Z",
    "dateReserved": "2026-04-22T18:50:43.621Z",
    "datePublished": "2026-04-29T15:10:37.899Z",
    "state": "PUBLISHED"
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        "dateUpdated": "2026-04-29T15:10:37.899Z"
      },
      "datePublic": "2026-04-28T19:00:00.000Z",
      "title": "cPanel and WHM Authentication Bypass via Login Flow",
      "descriptions": [
        {
          "lang": "en",
          "value": "cPanel and WHM versions prior to 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.134.0.20, and 11.136.0.5 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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              "value": "cPanel and WHM versions prior to 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.134.0.20, and 11.136.0.5 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel."
            }
          ]
        }
      ],
      "affected": [
        {
          "vendor": "cPanel, L.L.C.",
          "product": "cPanel & WHM",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "11.110.0",
              "status": "affected",
              "versionType": "semver",
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            },
            {
              "version": "11.118.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "11.118.0.63"
            },
            {
              "version": "11.126.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "11.126.0.54"
            },
            {
              "version": "11.132.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "11.132.0.29"
            },
            {
              "version": "11.134.0",
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            },
            {
              "version": "11.136.0",
              "status": "affected",
              "versionType": "semver",
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            }
          ]
        },
        {
          "vendor": "cPanel, L.L.C.",
          "product": "WP Squared",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "11.136.1",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "11.136.1.7"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-306 Missing Authentication for Critical Function",
              "cweId": "CWE-306",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026",
          "tags": [
            "vendor-advisory",
            "patch"
          ]
        },
        {
          "url": "https://docs.cpanel.net/release-notes/release-notes",
          "tags": [
            "release-notes"
          ]
        },
        {
          "url": "https://docs.wpsquared.com/changelogs/versions/changelog/#13617",
          "tags": [
            "release-notes"
          ]
        },
        {
          "url": "https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026",
          "tags": [
            "third-party-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
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        {
          "format": "CVSS",
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              "lang": "en",
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            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL"
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        }
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    "adp": [
      {
        "providerMetadata": {
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP",
          "dateUpdated": "2026-04-29T15:34:10.334Z"
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        "title": "CISA ADP Vulnrichment",
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