WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability
WebPros — cPanel & WHM and WP2 (WordPress Squared)
- Added to KEV catalog
- 30 April 2026
- Federal remediation due date
- 3 May 2026
- Weakness classification (CWE)
- CWE-306
AI Breakdown
What it is
This is a critical authentication bypass vulnerability in WebPros cPanel & WHM and WP2 (WordPress Squared) products. It allows unauthenticated remote attackers to completely bypass the login process and gain unauthorized access to your web hosting control panel. This means an attacker can take control of your server and hosted websites without needing any credentials.
Why it matters
This vulnerability is extremely urgent as it has a critical severity score of 9.8 out of 10 and is actively being exploited in ransomware campaigns. Attackers are already using this flaw to compromise systems, potentially leading to data theft, website defacement, or complete system takeover. Your organization's data and operations are at severe risk if this vulnerability remains unaddressed.
Recommended action
Your immediate priority is to apply any available patches or vendor-provided mitigations from WebPros for cPanel & WHM and WP2. If no effective mitigations are available, you must discontinue the use of these products to prevent unauthorized access. Refer to CISA's BOD 22-01 guidance if these services are cloud-based.
AI-generated from CISA and NVD data — treat as a starting point, not a substitute for your own risk assessment.
CISA Description
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.
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.
Notes
https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 ; https://docs.cpanel.net/release-notes/release-notes/ ; https://docs.wpsquared.com/changelogs/versions/changelog/#13617 ; https://nvd.nist.gov/vuln/detail/CVE-2026-41940"
NVD Technical 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.
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