CVE-2026-41940 CRITICAL

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

Vendor Webpros
Product cPanel
Weakness CWE-306 · Missing auth
KEV Status Known Exploited
Ransomware Used in campaigns
Published April 29, 2026
Last update May 6, 2026
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

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

What the vulnerability does

01Description

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.

CISA mandated remediation

02CISA 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.

Key dates

03Disclosure timeline

April 29, 2026 CVE published
May 6, 2026 Record updated

External resources

04References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-41940 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/306.html CISA KEV Reference https://support.cpanel.net/hc/en-us/articles/40073787579671-cP… CISA KEV Reference https://docs.cpanel.net/release-notes/release-notes/ CISA KEV Reference https://docs.wpsquared.com/changelogs/versions/changelog/#13617 CISA KEV Reference https://nvd.nist.gov/vuln/detail/CVE-2026-41940