{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-41940", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-04-22T18:50:43.621Z", "datePublished": "2026-04-29T15:10:37.899Z", "dateUpdated": "2026-08-11T03:55:30.673Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-05-06T15:48:18.270Z" }, "title": "WebPros cPanel and WHM Authentication Bypass via Login Flow", "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." } ], "datePublic": "2026-04-28T00:00:00.000Z", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-306", "description": "CWE-306 Missing Authentication for Critical Function", "type": "CWE" } ] } ], "affected": [ { "defaultStatus": "affected", "vendor": "WebPros", "product": "cPanel", "versions": [ { "status": "affected", "version": "11.40.0.0", "versionType": "custom", "lessThan": "11.86.0.41" }, { "status": "affected", "version": "11.88.0.0", "versionType": "custom", "lessThan": "11.94.0.28" }, { "status": "affected", "version": "11.96.0.0", "versionType": "custom", "lessThan": "11.102.0.39" }, { "status": "affected", "version": "11.104.0.0", "versionType": "custom", "lessThan": "11.110.0.97" }, { "status": "affected", "version": "11.112.0.0", "versionType": "custom", "lessThan": "11.118.0.63" }, { "status": "affected", "version": "11.120.0.0", "versionType": "custom", "lessThan": "11.124.0.35" }, { "status": "affected", "version": "11.126.0.0", "versionType": "custom", "lessThan": "11.126.0.54" }, { "status": "affected", "version": "11.128.0.0", "versionType": "custom", "lessThan": "11.130.0.19" }, { "status": "affected", "version": "11.132.0.0", "versionType": "custom", "lessThan": "11.132.0.29" }, { "status": "affected", "version": "11.134.0.0", "versionType": "custom", "lessThan": "11.134.0.20" }, { "status": "affected", "version": "11.136.0.0", "versionType": "custom", "lessThan": "11.136.0.5" } ] }, { "defaultStatus": "affected", "vendor": "WebPros", "product": "WP Squared", "versions": [ { "status": "unaffected", "version": "11.136.1.7", "versionType": "custom" } ] }, { "defaultStatus": "affected", "vendor": "WebPros", "product": "WHM", "versions": [ { "status": "affected", "version": "11.40.0.0", "versionType": "custom", "lessThan": "11.86.0.41" }, { "status": "affected", "version": "11.88.0.0", "versionType": "custom", "lessThan": "11.94.0.28" }, { "status": "affected", "version": "11.96.0.0", "versionType": "custom", "lessThan": "11.102.0.39" }, { "status": "affected", "version": "11.104.0.0", "versionType": "custom", "lessThan": "11.110.0.97" }, { "status": "affected", "version": "11.112.0.0", "versionType": "custom", "lessThan": "11.118.0.63" }, { "status": "affected", "version": "11.120.0.0", "versionType": "custom", "lessThan": "11.124.0.35" }, { "status": "affected", "version": "11.126.0.0", "versionType": "custom", "lessThan": "11.126.0.54" }, { "status": "affected", "version": "11.128.0.0", "versionType": "custom", "lessThan": "11.130.0.19" }, { "status": "affected", "version": "11.132.0.0", "versionType": "custom", "lessThan": "11.132.0.29" }, { "status": "affected", "version": "11.134.0.0", "versionType": "custom", "lessThan": "11.134.0.20" }, { "status": "affected", "version": "11.136.0.0", "versionType": "custom", "lessThan": "11.136.0.5" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.40.0.0", "versionEndExcluding": "11.86.0.41" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.88.0.0", "versionEndExcluding": "11.94.0.28" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.96.0.0", "versionEndExcluding": "11.102.0.39" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.104.0.0", "versionEndExcluding": "11.110.0.97" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.112.0.0", "versionEndExcluding": "11.118.0.63" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.120.0.0", "versionEndExcluding": "11.124.0.35" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.126.0.0", "versionEndExcluding": "11.126.0.54" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.128.0.0", "versionEndExcluding": "11.130.0.19" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.132.0.0", "versionEndExcluding": "11.132.0.29" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.134.0.0", "versionEndExcluding": "11.134.0.20" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.136.0.0", "versionEndExcluding": "11.136.0.5" } ] } ] }, { "nodes": [ { "operator": "OR", "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.40.0.0", "versionEndExcluding": "11.86.0.41" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.88.0.0", "versionEndExcluding": "11.94.0.28" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.96.0.0", "versionEndExcluding": "11.102.0.39" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.104.0.0", "versionEndExcluding": "11.110.0.97" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.112.0.0", "versionEndExcluding": "11.118.0.63" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.120.0.0", "versionEndExcluding": "11.124.0.35" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.126.0.0", "versionEndExcluding": "11.126.0.54" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.128.0.0", "versionEndExcluding": "11.130.0.19" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.132.0.0", "versionEndExcluding": "11.132.0.29" }, { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.134.0.0", "versionEndExcluding": "11.130.0.18" } ] } ] }, { "nodes": [ { "operator": "OR", "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:cpanel:wp_squared:*:*:*:*:*:*:*:*", "versionEndExcluding": "136.1.7" } ] } ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.3, "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" } }, { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "CRITICAL", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H" } } ], "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" ] } ], "source": { "discovery": "EXTERNAL" }, "x_generator": { "engine": "Vulnogram 1.0.2" } }, "adp": [ { "references": [ { "url": "https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py", "tags": [ "exploit" ] }, { "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940", "tags": [ "government-resource" ] } ], "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-04-29T00:00:00+00:00", "options": [ { "Exploitation": "active" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-41940" } } }, { "other": { "type": "kev", "content": { "dateAdded": "2026-04-30", "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-11T03:55:30.673Z" }, "timeline": [ { "time": "2026-04-30T00:00:00.000Z", "lang": "en", "value": "CVE-2026-41940 added to CISA KEV" } ] }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-05-04T16:13:16.841Z" }, "references": [ { "url": "https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/" }, { "url": "https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/" } ], "title": "CVE Program Container", "x_generator": { "engine": "ADPogram 0.0.1" } } ] } }