CVE-2026-41940 KEV EXPLOIT
9.8
CRITICAL · CVSS 3.1 · EPSS 98.5% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2026-05-03.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 98.53% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-306 |
| On CISA KEV | yes — remediate by 2026-05-03 |
| Public exploit | yes |
| Published | 2026-04-29 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability |
|---|---|
| Added | 2026-04-30 |
| Due | 2026-05-03 |
| Vendor / product | WebPros / cPanel & WHM and WP2 (WordPress Squared) |
| Ransomware use | known |
Affected (3)
| Vendor | Product |
|---|---|
| cpanel | cpanel |
| cpanel | whm |
| cpanel | wp squared |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | cPanel - CRLF Injection | 2026-05-26 |
References
- https://docs.cpanel.net/release-notes/release-notes
- https://docs.wpsquared.com/changelogs/versions/changelog/#13617
- https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026
- https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026
- https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow
- https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/
- https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/
- https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940
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