CVE-2026-41940

WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 98.5%

Published29 Apr 2026
Added to CISA KEV30 Apr 2026
Remediation due3 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Cpanel≥ 112.0.0 < 118.0.63 · ≥ 11.40 < 86.0.41 · ≥ 120.0.0 < 124.0.35 · ≥ 126.0.1 < 126.0.54

Cpanel Whm≥ 112.0.0 < 118.0.63 · ≥ 11.40 < 86.0.41 · ≥ 120.0.0 < 124.0.35 · ≥ 126.0.1 < 126.0.54

Cpanel Wp Squared< 136.1.7

Remediation

Fixed in

Cpanel≥ 118.0.63

Cpanel Whm≥ 118.0.63

Cpanel Wp Squared≥ 136.1.7

Patch & vendor advisories

https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026

References

https://docs.cpanel.net/release-notes/release-notesRelease Notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617Release Notes
https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.pyExploitThird Party Advisory
https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/ExploitThird Party Advisory
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026Vendor Advisory
https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/Press/Media Coverage
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940US Government Resource
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

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-41940 being actively exploited?

Yes. CVE-2026-41940 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 30 Apr 2026. It has been used in ransomware campaigns.

How severe is CVE-2026-41940?

CVE-2026-41940 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 98.5% probability of exploitation.

Which products are affected by CVE-2026-41940?

Affected products include Cpanel, Cpanel Whm, Cpanel Wp Squared.

How do I fix CVE-2026-41940?

Upgrade affected software to a fixed version, for example Cpanel 118.0.63, Cpanel Whm 118.0.63, Cpanel Wp Squared 136.1.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-41940 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.