Critical 9.8Known exploited (CISA KEV)Published Apr 29, 2026

CVE-2026-41940WebPros cPanel and WHM Authentication Bypass via Login Flow

Updated under an hour ago (Oct 26, 2026, 6:00 PM ET)

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It affects WebPros cPanel and 5 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Apr 30, 2026; federal agencies had to remediate by May 3, 2026, and it is known to be used in ransomware. Treat that date as your deadline.

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Every CVE for WebPros cPanel

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-306
Known exploited: Added to CISA KEV Apr 30, 2026; federal remediation due May 3, 2026; known ransomware useApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 98.53% (percentile 100)
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Sep 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

WebPros cPanel webpros:cpanel (from the name)	from 11.40.0.0 before 11.86.0.41; from 11.88.0.0 before 11.94.0.28; from 11.96.0.0 before 11.102.0.39; from 11.104.0.0 before 11.110.0.97; from 11.112.0.0 before 11.118.0.63; from 11.120.0.0 before 11.124.0.35; from 11.126.0.0 before 11.126.0.54; from 11.128.0.0 before 11.130.0.19; and 3 more ranges	CNA record
WebPros WP Squared webpros:wp_squared (from the name)	before 11.136.1.7	CNA record
WebPros WHM webpros:whm (from the name)	from 11.40.0.0 before 11.86.0.41; from 11.88.0.0 before 11.94.0.28; from 11.96.0.0 before 11.102.0.39; from 11.104.0.0 before 11.110.0.97; from 11.112.0.0 before 11.118.0.63; from 11.120.0.0 before 11.124.0.35; from 11.126.0.0 before 11.126.0.54; from 11.128.0.0 before 11.130.0.19; and 3 more ranges	CNA record
cpanel cpanel cpanel:cpanel	from 11.40 before 86.0.41; from 88.0.0 before 110.0.97; from 112.0.0 before 118.0.63; from 120.0.0 before 124.0.35; from 126.0.1 before 126.0.54; from 128.0.0 before 130.0.19; from 132.0.0 before 132.0.29; from 134.0.0 before 134.0.20; and 1 more ranges	NVD
cpanel whm cpanel:whm	from 11.40 before 86.0.41; from 88.0.0 before 110.0.97; from 112.0.0 before 118.0.63; from 120.0.0 before 124.0.35; from 126.0.1 before 126.0.54; from 128.0.0 before 130.0.19; from 132.0.0 before 132.0.29; from 134.0.0 before 134.0.20; and 1 more ranges	NVD
cpanel wp_squared cpanel:wp_squared	before 136.1.7	NVD

References

References

https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026	vendor-advisory, patch
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
https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/	exploit, third-party-advisory
https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/	press/media-coverage
https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py	exploit, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.