CVE-2026-41940 Details.
cPanel & WHM - Authentication Bypass via Session-File CRLF Injection
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-41940. What It Means.
cPanel and WHM versions prior to 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.134.0.20, and 11.136.0.5 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.
Affected Product. What Is Hit.
The record for CVE-2026-41940 does not name a vendor or product yet.
References. Where To Read More.
- https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026
- https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/
- https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py
- https://hadrian.io/blog/cve-2026-41940-a-critical-authentication-bypass-in-cpanel
- https://nvd.nist.gov/vuln/detail/CVE-2026-41940
FAQ
Common Questions.
cPanel & WHM - Authentication Bypass via Session-File CRLF Injection. cPanel and WHM versions prior to 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.134.0.20, and 11.136.0.5 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-41940 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
Yes. CVE-2026-41940 is on the CISA Known Exploited Vulnerabilities list, which means attackers have used it against real targets.
Update the affected software to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-41940. Atlas does not run a check for it, so nothing here says whether a particular site is affected.