CVE-2026-41940
critical · 9.3Actively exploitedOn the CISA Known Exploited Vulnerabilities catalog
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
A public exploit / detection template exists
Weaponised detection is publicly available, which meaningfully raises real-world risk regardless of CVSS. nuclei-templates →
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: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
Weaknesses
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| cpanel | cpanel | >= 11.40, < 86.0.41 |
| cpanel | cpanel | >= 88.0.0, < 110.0.97 |
| cpanel | cpanel | >= 112.0.0, < 118.0.63 |
| cpanel | cpanel | >= 120.0.0, < 124.0.35 |
| cpanel | cpanel | >= 126.0.1, < 126.0.54 |
| cpanel | cpanel | >= 128.0.0, < 130.0.19 |
| cpanel | cpanel | >= 132.0.0, < 132.0.29 |
| cpanel | cpanel | >= 134.0.0, < 134.0.20 |
| cpanel | cpanel | >= 136.0.0, < 136.0.5 |
| cpanel | whm | >= 11.40, < 86.0.41 |
| cpanel | whm | >= 88.0.0, < 110.0.97 |
| cpanel | whm | >= 112.0.0, < 118.0.63 |
| cpanel | whm | >= 120.0.0, < 124.0.35 |
| cpanel | whm | >= 126.0.1, < 126.0.54 |
| cpanel | whm | >= 128.0.0, < 130.0.19 |
| cpanel | whm | >= 132.0.0, < 132.0.29 |
| cpanel | whm | >= 134.0.0, < 134.0.20 |
| cpanel | whm | >= 136.0.0, < 136.0.5 |
| cpanel | wp_squared | < 136.1.7 |
Check a specific version with /api/v1/cve/match.
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
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-41940