CVEs / CVE-2026-41940

CVE-2026-41940: WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability

Known exploited in the CISA KEV catalog since 30 Apr 2026
critical 9.3 CVSS 4.0 (from the CNA)
EPSS 98.5% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
Last changed at its sources 26 Oct 2026

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Summary

WebPros cPanel & WHM (WebHost Manager) and WP2 (WordPress Squared) contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.
CISA, Known Exploited Vulnerabilities catalog

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.
The CVE record, via NVD · published 29 Apr 2026 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
WebPros cPanel	from 11.40.0.0, before 11.86.0.41	11.86.0.41
WebPros cPanel	from 11.88.0.0, before 11.94.0.28	11.94.0.28
WebPros cPanel	from 11.96.0.0, before 11.102.0.39	11.102.0.39
WebPros cPanel	from 11.104.0.0, before 11.110.0.97	11.110.0.97
WebPros cPanel	from 11.112.0.0, before 11.118.0.63	11.118.0.63
WebPros cPanel	from 11.120.0.0, before 11.124.0.35	11.124.0.35
WebPros cPanel	from 11.126.0.0, before 11.126.0.54	11.126.0.54
WebPros cPanel	from 11.128.0.0, before 11.130.0.19	11.130.0.19
WebPros cPanel	from 11.132.0.0, before 11.132.0.29	11.132.0.29
WebPros cPanel	from 11.134.0.0, before 11.134.0.20	11.134.0.20
WebPros cPanel	from 11.136.0.0, before 11.136.0.5	11.136.0.5
WebPros WP Squared	before 11.136.1.7	11.136.1.7
WebPros WHM	from 11.40.0.0, before 11.86.0.41	11.86.0.41
WebPros WHM	from 11.88.0.0, before 11.94.0.28	11.94.0.28
WebPros WHM	from 11.96.0.0, before 11.102.0.39	11.102.0.39
WebPros WHM	from 11.104.0.0, before 11.110.0.97	11.110.0.97
WebPros WHM	from 11.112.0.0, before 11.118.0.63	11.118.0.63
WebPros WHM	from 11.120.0.0, before 11.124.0.35	11.124.0.35
WebPros WHM	from 11.126.0.0, before 11.126.0.54	11.126.0.54
WebPros WHM	from 11.128.0.0, before 11.130.0.19	11.130.0.19
WebPros WHM	from 11.132.0.0, before 11.132.0.29	11.132.0.29
WebPros WHM	from 11.134.0.0, before 11.134.0.20	11.134.0.20
WebPros WHM	from 11.136.0.0, before 11.136.0.5	11.136.0.5

Exploitation

In CISA KEV since	30 Apr 2026
Due date for US federal agencies	3 May 2026
Used in ransomware campaigns	Known
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.

Severity

CVSS 4.0	9.3 critical `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` Scored by the CNA ([email protected])
Weakness	CWE-306

References

CVE-2026-41940 on NVD
CVE-2026-41940 in the CISA KEV catalog
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 (cited by CISA)
https://docs.cpanel.net/release-notes/release-notes/ (cited by CISA)
https://docs.wpsquared.com/changelogs/versions/changelog/#13617 (cited by CISA)
https://docs.cpanel.net/release-notes/release-notes Release Notes
https://docs.wpsquared.com/changelogs/versions/changelog/#13617 Release Notes
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 Vendor Advisory
https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026 Third Party Advisory
https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow Third 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.py Exploit, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940 US Government Resource

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

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