Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
cPanel11.40.0.0 – < 11.86.0.4111.86.0.41CNA
cPanel11.88.0.0 – < 11.94.0.2811.94.0.28CNA
cPanel11.96.0.0 – < 11.102.0.3911.102.0.39CNA
cPanel11.104.0.0 – < 11.110.0.9711.110.0.97CNA
cPanel11.112.0.0 – < 11.118.0.6311.118.0.63CNA
cPanel11.120.0.0 – < 11.124.0.3511.124.0.35CNA
cPanel11.126.0.0 – < 11.126.0.5411.126.0.54CNA
cPanel11.128.0.0 – < 11.130.0.1911.130.0.19CNA
cPanel11.132.0.0 – < 11.132.0.2911.132.0.29CNA
cPanel11.134.0.0 – < 11.134.0.2011.134.0.20CNA
cPanel11.136.0.0 – < 11.136.0.511.136.0.5CNA
WP Squared< 11.136.1.711.136.1.7CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: active · Automatable: yes · Technical impact: total

References

patchsupport.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026refdocs.cpanel.net/release-notes/release-notesrefdocs.wpsquared.com/changelogs/versions/changelog/#13617writeupnamecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026writeupvulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flowexploitgithub.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.pyrefcisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940refbleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacksreflabs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940kevcisa.gov/known-exploited-vulnerabilities-catalog