CVE-2026-41940

Name: CVE-2026-41940
Creator: NVD / NIST
Published: 2026-04-29T16:16:25.037+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10Actively ExploitedEPSS 98.10%

Last modified Jun 17, 2026

CVE-2026-41940 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 98.10% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

CVSS 4.0

9.3/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

98.10%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2026.

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Cpanel	Cpanel	>= 11.40, < 86.0.41
Cpanel	Cpanel	>= 88.0.0, < 110.0.97
Cpanel	Cpanel	>= 112.0.0, < 118.0.63
Cpanel	Cpanel	>= 120.0.0, < 124.0.35
Cpanel	Cpanel	>= 126.0.1, < 126.0.54
Cpanel	Cpanel	>= 128.0.0, < 130.0.19
Cpanel	Cpanel	>= 132.0.0, < 132.0.29
Cpanel	Cpanel	>= 134.0.0, < 134.0.20
Cpanel	Cpanel	>= 136.0.0, < 136.0.5
Cpanel	Whm	>= 11.40, < 86.0.41
Cpanel	Whm	>= 88.0.0, < 110.0.97
Cpanel	Whm	>= 112.0.0, < 118.0.63
Cpanel	Whm	>= 120.0.0, < 124.0.35
Cpanel	Whm	>= 126.0.1, < 126.0.54
Cpanel	Whm	>= 128.0.0, < 130.0.19
Cpanel	Whm	>= 132.0.0, < 132.0.29
Cpanel	Whm	>= 134.0.0, < 134.0.20
Cpanel	Whm	>= 136.0.0, < 136.0.5
Cpanel	Wp Squared	< 136.1.7

References

https://docs.cpanel.net/release-notes/release-notesRelease Notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617Release Notes
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026Vendor Advisory
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

Timeline

Published: Apr 29, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-41940?

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.

How severe is CVE-2026-41940?

CVE-2026-41940 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 98.10% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2026-41940?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-41940?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST