CVE-2026-41940WebPros cPanel and WHM Authentication Bypass via Login Flow
Updated under an hour ago ()
Does this affect you?
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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Free account, 1 product
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
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
- https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026vendor-advisory, patch
- https://docs.cpanel.net/release-notes/release-notesrelease-notes
- https://docs.wpsquared.com/changelogs/versions/changelog/#13617release-notes
- https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026third-party-advisory
- https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flowthird-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.pyexploit, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940us-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.