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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.

PUBLISHED Reserved 2026-04-22 | Published 2026-04-29 | Updated 2026-05-06 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

Date added 2026-04-30 | Due date 2026-05-03

Known Ransomware Campaign(s)  

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Problem types

CWE-306 Missing Authentication for Critical Function

Product status

Default status
affected

11.40.0.0 (custom) before 11.86.0.41
affected

11.88.0.0 (custom) before 11.94.0.28
affected

11.96.0.0 (custom) before 11.102.0.39
affected

11.104.0.0 (custom) before 11.110.0.97
affected

11.112.0.0 (custom) before 11.118.0.63
affected

11.120.0.0 (custom) before 11.124.0.35
affected

11.126.0.0 (custom) before 11.126.0.54
affected

11.128.0.0 (custom) before 11.130.0.19
affected

11.132.0.0 (custom) before 11.132.0.29
affected

11.134.0.0 (custom) before 11.134.0.20
affected

11.136.0.0 (custom) before 11.136.0.5
affected

Default status
affected

11.136.1.7 (custom)
unaffected

Default status
affected

11.40.0.0 (custom) before 11.86.0.41
affected

11.88.0.0 (custom) before 11.94.0.28
affected

11.96.0.0 (custom) before 11.102.0.39
affected

11.104.0.0 (custom) before 11.110.0.97
affected

11.112.0.0 (custom) before 11.118.0.63
affected

11.120.0.0 (custom) before 11.124.0.35
affected

11.126.0.0 (custom) before 11.126.0.54
affected

11.128.0.0 (custom) before 11.130.0.19
affected

11.132.0.0 (custom) before 11.132.0.29
affected

11.134.0.0 (custom) before 11.134.0.20
affected

11.136.0.0 (custom) before 11.136.0.5
affected

References

github.com/...s/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py exploit

www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-41940 government-resource

www.bleepingcomputer.com/...ted-in-sorry-ransomware-attacks/

labs.watchtowr.com/...-authentication-bypass-cve-2026-41940/

support.cpanel.net/...-cPanel-WHM-Security-Update-04-28-2026 vendor-advisory patch

docs.cpanel.net/release-notes/release-notes release-notes

docs.wpsquared.com/changelogs/versions/changelog/ release-notes

www.namecheap.com/...y-vulnerability-in-cpanel-april-28-2026 third-party-advisory

www.vulncheck.com/...hm-authentication-bypass-via-login-flow third-party-advisory

cve.org (CVE-2026-41940)

nvd.nist.gov (CVE-2026-41940)

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