CVE-2026-41940

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): VulnCheck
CVSS severity: CRITICAL
CVSS score: 9.3 / 10
CVSS 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
Effective score: 9.3 / 10 CRITICAL source: CNA overview
CWE(s): CWE-306
Reserved: 2026-04-22
Published: 2026-04-29 15:10 UTC
Last updated: 2026-05-06 15:48 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/41xxx/CVE-2026-41940.json
Linked Threat: CVE-2026-41940 — WebPros cPanel & WHM and WP2 (WordPress Squared): WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability
Vendor / project: WebPros
Product: cPanel & WHM and WP2 (WordPress Squared)
Date added to KEV: 2026-04-30
Remediation due: 2026-05-03
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.
Ransomware campaign use: Known
CISA notes: https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 ; https://docs.cpanel.net/release-notes/release-notes/ ; https://docs.wpsquared.com/changelogs/versions/changelog/#13617 ; https://nvd.nist.gov/vuln/detail/CVE-2026-41940"
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-04-29 16:16:25 UTC
NVD last modified: 2026-05-04 18:09:42 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: disclosure@vulncheck.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.8501 (probability of exploitation in next 30 days)
EPSS percentile: 99.36% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-26246
Assigner: VulnCheck
Published: Apr 29, 2026, 3:10:37 PM
Updated: May 6, 2026, 3:48:18 PM
EUVD base score (CVSS 4.0): 9.3 / 10
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
EUVD-reported EPSS: 90.7600
Vendors: cPanel, L.L.C., cPanel, WebPros
Products: cPanel (11.136.0.0 <11.136.0.5)

cPanel (11.126.0.0 <11.126.0.54)

WHM (11.88.0.0 <11.110.0.97)

WHM (11.132.0.0 <11.132.0.29)

cPanel (11.134.0 <11.134.0.20)

cPanel & WHM (11.110.0 <11.110.0.97)

cPanel (11.104.0.0 <11.110.0.97)

cPanel (11.118.0 <11.118.0.63)

WHM (11.136.0.0 <11.136.0.5)

cPanel (11.134.0.0 <11.134.0.20)

WHM (11.126.0.0 <11.126.0.54)

cPanel (11.88.0.0 <11.110.0.97)

cPanel (11.86.0 <11.86.0.41)

WHM (11.120.0.0 <11.124.0.35)

WHM (11.126.0 <11.126.0.54)

WHM (11.110.0 <11.110.0.97)

cPanel (11.136.0 <11.136.0.5)

WHM (11.132.0 <11.132.0.29)

cPanel (11.88.0.0 <11.94.0.28)

cPanel (11.132.0 <11.132.0.29)

WHM (11.134.0 <11.134.0.20)

WP Squared (136.1.0 <136.1.7)

cPanel & WHM (11.136.0 <11.136.0.5)

cPanel (11.120.0.0 <11.124.0.35)

WHM (11.120.0.0 <11.126.0.54)

cPanel (11.110.0 <11.110.0.97)

cPanel & WHM (11.134.0 <11.134.0.20)

WP Squared (patch: 11.136.1.7)

cPanel (11.132.0.0 <11.132.0.29)

WHM (11.96.0.0 <11.102.0.39)

WHM (11.40.0.0 <11.86.0.41)

WHM (11.130.0 <11.130.0.18)

cPanel (11.120.0.0 <11.126.0.54)

WHM (11.86.0 <11.86.0.41)

WHM (11.104.0.0 <11.110.0.97)

cPanel & WHM (11.126.0 <11.126.0.54)

WHM (11.112.0.0 <11.118.0.63)

WHM (11.125.0.0 <11.126.0.54)

WHM (11.134.0.0 <11.134.0.20)

cPanel (11.96.0.0 <11.102.0.39)

cPanel (11.128.0.0 <11.130.0.19)

cPanel (11.40.0.0 <11.86.0.41)

cPanel & WHM (11.132.0 <11.132.0.29)

cPanel (11.125.0.0 <11.126.0.54)

cPanel (11.130.0 <11.130.0.18)

WHM (11.136.0 <11.136.0.5)

WP Squared (11.136.1 <11.136.1.7)

cPanel (11.112.0.0 <11.118.0.63)

WHM (11.118.0 <11.118.0.63)

cPanel (11.126.0 <11.126.0.54)

WHM (11.128.0.0 <11.130.0.19)

cPanel & WHM (11.118.0 <11.118.0.63)

WHM (11.88.0.0 <11.94.0.28)

ENISA description: 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.

EUVD references (5)

Affected products (3)

Vendor	Product	Versions	Platforms
WebPros	cPanel	`11.40.0.0` (affected), `11.88.0.0` (affected), `11.96.0.0` (affected), `11.104.0.0` (affected), `11.112.0.0` (affected), `11.120.0.0` (affected), `11.126.0.0` (affected), `11.128.0.0` (affected), `11.132.0.0` (affected), `11.134.0.0` (affected), `11.136.0.0` (affected)	—
WebPros	WP Squared	`11.136.1.7` (unaffected)	—
WebPros	WHM	`11.40.0.0` (affected), `11.88.0.0` (affected), `11.96.0.0` (affected), `11.104.0.0` (affected), `11.112.0.0` (affected), `11.120.0.0` (affected), `11.126.0.0` (affected), `11.128.0.0` (affected), `11.132.0.0` (affected), `11.134.0.0` (affected), `11.136.0.0` (affected)	—

Affected products — CPE 2.3 (3) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:whm:*:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:wp_squared:*:*:*:*:*:wordpress:*:*

Vendor references (5)

References embedded in the original CVE record by the assigning CNA.

https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 vendor-advisorypatch
https://docs.cpanel.net/release-notes/release-notes release-notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617 release-notes
https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026 third-party-advisory
https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow third-party-advisory

MITRE references (5) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow third-party-advisory
https://docs.cpanel.net/release-notes/release-notes release-notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617 release-notes
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 vendor-advisory, patch
https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026 third-party-advisory

Web references (4)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

https://attackerkb.com/topics/CVE-2026-41940 rapid7:attackerkb.com
http://cwe.mitre.org/data/definitions/306.html rapid7:cwe.mitre.org
https://docs.cpanel.net/security/security-advisories/ rapid7:docs.cpanel.net
https://www.cve.org/CVERecord?id=CVE-2026-41940 rapid7:www.cve.org

NVD-tagged references (9)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://docs.cpanel.net/release-notes/release-notes disclosure@vulncheck.com Release Notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617 disclosure@vulncheck.com Release Notes
https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py 134c704f-9b21-4f2e-91b3-4a467353bcc0 ExploitThird Party Advisory
https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/ af854a3a-2127-422b-91ae-364da2661108 ExploitThird Party Advisory
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 disclosure@vulncheck.com Vendor Advisory
https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/ af854a3a-2127-422b-91ae-364da2661108 Press/Media Coverage
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource
https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026 disclosure@vulncheck.com Third Party Advisory
https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow disclosure@vulncheck.com Third Party Advisory

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cve	`CVE-2026-41940`	no local data	2026-05-14 02:58 UTC
cwe	`CWE-306`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Fix CVE-2026-41940: Patch the Critical cPanel Authentication Bypass ...

web:www.veeble.com

CVE-2026-41940 is a critical authentication bypass vulnerability in cPanel & WHM that allows an unauthenticated remote attacker to gain full root-level administrative access to any affected server without a username or password. With a CVSS v3.1 score of 9.8 and confirmed in-the-wild exploitation dating back to February 23, 2026 , two months before a patch was available, this is one of the most ...

2026-05-14 06:47 UTC
CVE-2026-41940: The cPanel Authentication Bypass That Runs 70 Million ...

web:coderoasis.com

CVE-2026-41940 is a CVSS 9.8 authentication bypass in cPanel/WHM affecting every version after 11.40. It was a zero-day for two months, 44,000 IPs are now scanning, ransomware has deployed, and a state-linked actor is hitting Southeast Asian government networks. Patch now.

2026-05-14 06:47 UTC
cPanel Vulnerability CVE-2026-41940 Puts 70 Million Websites at Risk ...

web:cyberunit.com

A critical cPanel and WHM authentication bypass ( CVE-2026-41940 , CVSS 9.8) exposes roughly 1.5 million servers and an estimated 70 million websites. Attackers exploited the flaw for two months before the April 28, 2026 patch .

2026-05-14 06:47 UTC
CVE-2026-41940: cPanel & WHM Auth Bypass Flaw - socprime.com

web:socprime.com

A newly disclosed CVE-2026-41940 vulnerability in cPanel & WHM has put internet-facing hosting infrastructure under urgent scrutiny. The flaw carries a CVSS score of 9.8 and can let an unauthenticated remote attacker bypass authentication and gain administrative access, while cPanel's advisory says the issue affects cPanel software, including DNSOnly, across all versions after 11.40. For ...

2026-05-14 06:47 UTC
CVE-2026-41940 cPanel and WHM: Details, Next Steps | Bitsight

web:www.bitsight.com

A critical vulnerability, CVE-2026-41940 , affecting cPanel, WHM, and WP Squared, is being actively exploited. Read more for technical details & impact.

2026-05-14 06:47 UTC
cPanel Vulnerability CVE-2026-41940: Fix, Risk, Response

web:almcorp.com

A fact-based guide to the actively exploited cPanel vulnerability CVE-2026-41940 , including affected versions, business risk, patch steps, detection guidance, and response actions.

2026-05-14 06:47 UTC
CVE-2026-41940: Response, Actions and Next Steps - cPanel

web:www.cpanel.net

cPanel & WHM security update for CVE-2026-41940 : what was fixed, how to apply the patch , legacy version coverage, and detection tooling.

2026-05-14 06:47 UTC
CVE-2026-41940 Explained: The cPanel & WHM Authentication Bypass That ...

web:www.picussecurity.com

CVE-2026-41940 explained: how a CRLF injection bypassed cPanel & WHM authentication on 1.5M servers. Root cause, exploit chain, IOCs, and patch guidance.

2026-05-14 06:47 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-05-03 Known ransomware campaign use: Known

2026-05-14 01:13 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-41940.json.

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