CASCACascade Atlas

Evidence dossier

CVE-2026-41940

WebPros cPanel and WHM Authentication Bypass via Login Flow

83.1–99.3Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Apr 29, 2026
Updated
May 6, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS98.10%

2026-07-18 · v2026.06.15 · percentile 99.9%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
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CISA ADP Vulnrichment

CVEderivative copy
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CVE Program Container

VulnCheckoriginal assertion
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WebPros cPanel and WHM Authentication Bypass via Login Flow

CISA KEVoriginal assertion
observed_exploitation

WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.981000000000; percentile 0.999070000000

Applicability

Cited product scope

Trace impact →
WebProscPanel
[{"status": "affected", "version": "11.40.0.0", "lessThan": "11.86.0.41", "versionType": "custom"}, {"status": "affected", "version": "11.88.0.0", "lessThan": "11.94.0.28", "versionType": "custom"}, {"status": "affected", "version": "11.96.0.0", "lessThan": "11.102.0.39", "versionType": "custom"}, {"status": "affected", "version": "11.104.0.0", "lessThan": "11.110.0.97", "versionType": "custom"}, {"status": "affected", "version": "11.112.0.0", "lessThan": "11.118.0.63", "versionType": "custom"}, {"status": "affected", "version": "11.120.0.0", "lessThan": "11.124.0.35", "versionType": "custom"}, {"status": "affected", "version": "11.126.0.0", "lessThan": "11.126.0.54", "versionType": "custom"}, {"status": "affected", "version": "11.128.0.0", "lessThan": "11.130.0.19", "versionType": "custom"}, {"status": "affected", "version": "11.132.0.0", "lessThan": "11.132.0.29", "versionType": "custom"}, {"status": "affected", "version": "11.134.0.0", "lessThan": "11.134.0.20", "versionType": "custom"}, {"status": "affected", "version": "11.136.0.0", "lessThan": "11.136.0.5", "versionType": "custom"}]unknown
WebProsWHM
[{"status": "affected", "version": "11.40.0.0", "lessThan": "11.86.0.41", "versionType": "custom"}, {"status": "affected", "version": "11.88.0.0", "lessThan": "11.94.0.28", "versionType": "custom"}, {"status": "affected", "version": "11.96.0.0", "lessThan": "11.102.0.39", "versionType": "custom"}, {"status": "affected", "version": "11.104.0.0", "lessThan": "11.110.0.97", "versionType": "custom"}, {"status": "affected", "version": "11.112.0.0", "lessThan": "11.118.0.63", "versionType": "custom"}, {"status": "affected", "version": "11.120.0.0", "lessThan": "11.124.0.35", "versionType": "custom"}, {"status": "affected", "version": "11.126.0.0", "lessThan": "11.126.0.54", "versionType": "custom"}, {"status": "affected", "version": "11.128.0.0", "lessThan": "11.130.0.19", "versionType": "custom"}, {"status": "affected", "version": "11.132.0.0", "lessThan": "11.132.0.29", "versionType": "custom"}, {"status": "affected", "version": "11.134.0.0", "lessThan": "11.134.0.20", "versionType": "custom"}, {"status": "affected", "version": "11.136.0.0", "lessThan": "11.136.0.5", "versionType": "custom"}]unknown
WebProsWP Squared
[{"status": "unaffected", "version": "11.136.1.7", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 11.40; end excluding 86.0.41supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 88.0.0; end excluding 110.0.97supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 112.0.0; end excluding 118.0.63supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 120.0.0; end excluding 124.0.35supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 126.0.1; end excluding 126.0.54supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 128.0.0; end excluding 130.0.19supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 132.0.0; end excluding 132.0.29supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 134.0.0; end excluding 134.0.20supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*; start including 136.0.0; end excluding 136.0.5supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 11.40; end excluding 86.0.41supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 88.0.0; end excluding 110.0.97supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 112.0.0; end excluding 118.0.63supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 120.0.0; end excluding 124.0.35supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 126.0.1; end excluding 126.0.54supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 128.0.0; end excluding 130.0.19supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 132.0.0; end excluding 132.0.29supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 134.0.0; end excluding 134.0.20supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*; start including 136.0.0; end excluding 136.0.5supported
Unknown vendorUnknown product
cpe:2.3:a:cpanel:wp_squared:*:*:*:*:*:wordpress:*:*; end excluding 136.1.7supported

Assessments

CVSS by origin

9.3
disclosure@vulncheck.comCVSS 4.0 · role SecondaryCVSS: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
9.8
disclosure@vulncheck.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3
VulnCheckCVSS 4.0 · role unknownCVSS: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
VulnCheckCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.