---
title: "CVE-2026-41940: WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-41940/
description: "CVE-2026-41940 (WebPros cPanel & WHM and WP2 (WordPress Squared)): Exploited in the wild (CISA KEV). cPanel and WHM versions after 11.40 contain an…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-29
date_modified: 2026-09-30
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-41940"
kev: true
cvss: 9.3
epss: 0.98527
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run WebPros cPanel & WHM and WP2 (WordPress Squared). CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-04-30, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-05-03 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 98.5% , percentile 99.9: FIRST’s model estimates a 98.5% chance of exploitation activity in the next 30 days, higher than 99.9% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- WebPros cPanel: 11.40.0.0 < 11.86.0.41, 11.88.0.0 < 11.94.0.28, 11.96.0.0 < 11.102.0.39, 11.104.0.0 < 11.110.0.97, 11.112.0.0 < 11.118.0.63, 11.120.0.0 < 11.124.0.35, 11.126.0.0 < 11.126.0.54, 11.128.0.0 < 11.130.0.19, 11.132.0.0 < 11.132.0.29, 11.134.0.0 < 11.134.0.20, 11.136.0.0 < 11.136.0.5
- WebPros WP Squared: < 11.136.1.7
- WebPros WHM: 11.40.0.0 < 11.86.0.41, 11.88.0.0 < 11.94.0.28, 11.96.0.0 < 11.102.0.39, 11.104.0.0 < 11.110.0.97, 11.112.0.0 < 11.118.0.63, 11.120.0.0 < 11.124.0.35, 11.126.0.0 < 11.126.0.54, 11.128.0.0 < 11.130.0.19, 11.132.0.0 < 11.132.0.29, 11.134.0.0 < 11.134.0.20, 11.136.0.0 < 11.136.0.5

## Severity

- VulnCheck CVSS 4.0: 9.3 `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`
- VulnCheck CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-04-30; federal due date 2026-05-03. Known ransomware use: Known.
- 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 SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 98.53% probability of exploitation activity in the next 30 days; percentile 99.9.

## Sources

- [support.cpanel.net](https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026)
- [docs.cpanel.net](https://docs.cpanel.net/release-notes/release-notes)
- [docs.wpsquared.com](https://docs.wpsquared.com/changelogs/versions/changelog/#13617)
- [CVE.org record CVE-2026-41940](https://www.cve.org/CVERecord?id=CVE-2026-41940)
- [NVD entry CVE-2026-41940](https://nvd.nist.gov/vuln/detail/CVE-2026-41940)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940)
- [Listed in CISA KEV notes (nvd.nist.gov)](https://nvd.nist.gov/vuln/detail/CVE-2026-41940")
- [namecheap.com](https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026)
- [vulncheck.com](https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow)
- [github.com](https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py)
- [bleepingcomputer.com](https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/)
- [labs.watchtowr.com](https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/)

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Source page: https://erroneo.us/security/cve/CVE-2026-41940/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt