Known exploited vulnerability
CVE-2026-41940
The short answer
CVE-2026-41940 affects WebPros cPanel and is rated critical (CVSS 9.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-04-30: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-306.
Severity
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
Exploited (CISA KEV)
Yes, since Apr 30, 2026
Federal due date May 3, 2026
EPSS, next 30 days
99%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
cPanel, WP Squared, WHM. NVD's record lists the exact affected versions.
References
- docs.cpanel.net/release-notes/release-notes Release Notes
- docs.wpsquared.com/changelogs/versions/changelog/#13617 Release Notes
- support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 Vendor Advisory
- www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026 Third Party Advisory
- www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow Third Party Advisory
- labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/ ExploitThird Party Advisory
- www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/ Press/Media Coverage
- github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py ExploitThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940 US Government Resource
Questions
Is CVE-2026-41940 being exploited?
Yes. CISA added CVE-2026-41940 to its Known Exploited Vulnerabilities catalog on 2026-04-30, with a federal remediation due date of 2026-05-03. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2026-41940?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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