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CVE-2026-41940: WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability

In short

WebPros cPanel & WHM and WP2 (WordPress Squared) has a weakness classified as missing authentication for critical function (CWE-306). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-04-30. NVD lists CVSS 4.0 at 9.3 CRITICAL. CISA reports known ransomware campaign use.

What it is

“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.” — CISA KEV, retrieved 2026-11-01
“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.” — NVD, retrieved 2026-11-01

Who is affected

WebPros cPanel & WHM and WP2 (WordPress Squared). NVD lists the following versions as affected:

  • Cpanel Cpanel: from 11.40 inclusive, before 86.0.41
  • Cpanel Cpanel: from 88.0.0 inclusive, before 110.0.97
  • Cpanel Cpanel: from 112.0.0 inclusive, before 118.0.63
  • Cpanel Cpanel: from 120.0.0 inclusive, before 124.0.35
  • Cpanel Cpanel: from 126.0.1 inclusive, before 126.0.54
  • Cpanel Cpanel: from 128.0.0 inclusive, before 130.0.19
  • Cpanel Cpanel: from 132.0.0 inclusive, before 132.0.29
  • Cpanel Cpanel: from 134.0.0 inclusive, before 134.0.20
  • Cpanel Cpanel: from 136.0.0 inclusive, before 136.0.5
  • Cpanel Whm: from 11.40 inclusive, before 86.0.41
  • Cpanel Whm: from 88.0.0 inclusive, before 110.0.97
  • Cpanel Whm: from 112.0.0 inclusive, before 118.0.63
  • Cpanel Whm: from 120.0.0 inclusive, before 124.0.35
  • Cpanel Whm: from 126.0.1 inclusive, before 126.0.54
  • Cpanel Whm: from 128.0.0 inclusive, before 130.0.19
  • Cpanel Whm: from 132.0.0 inclusive, before 132.0.29
  • Cpanel Whm: from 134.0.0 inclusive, before 134.0.20
  • Cpanel Whm: from 136.0.0 inclusive, before 136.0.5
  • Cpanel Wp Squared: before 136.1.7

Exploitation status

CISA KEV added: 2026-04-30. Known ransomware campaign use: Known (reported by CISA). Due date CISA set for US federal civilian agencies: 2026-05-03.

Scores

NVD CVSS 4.0: 9.3 CRITICAL; vector 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; source [email protected].

EPSS by FIRST: 98.53%; percentile 99.92; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-306.

Timeline

Source events
DateEvent
2026-04-29T16:16:25.037NVD published
2026-04-30CISA KEV added
2026-05-03CISA KEV due
2026-10-26T20:10:00.160NVD last modified
2026-10-31FIRST EPSS score

CISA 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.” — CISA KEV

What to do

  • Confirm whether you run WebPros cPanel & WHM and WP2 (WordPress Squared) and which version.
  • Apply the vendor update or mitigation in the advisory.
  • Follow CISA’s required action.
  • Review the vendor guidance on signs of compromise.
  • Track the fix through completion.

References

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.

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