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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
WebPros cPanel
Default version status: affected
11.40.0.0 to < 11.86.0.41affected11.88.0.0 to < 11.94.0.28affected11.96.0.0 to < 11.102.0.39affected11.104.0.0 to < 11.110.0.97affected11.112.0.0 to < 11.118.0.63affected11.120.0.0 to < 11.124.0.35affected11.126.0.0 to < 11.126.0.54affected11.128.0.0 to < 11.130.0.19affected11.132.0.0 to < 11.132.0.29affected11.134.0.0 to < 11.134.0.20affected11.136.0.0 to < 11.136.0.5affected
WebPros WP Squared
Default version status: unaffected
0 to < 11.136.1.7affected
WebPros WHM
Default version status: affected
11.40.0.0 to < 11.86.0.41affected11.88.0.0 to < 11.94.0.28affected11.96.0.0 to < 11.102.0.39affected11.104.0.0 to < 11.110.0.97affected11.112.0.0 to < 11.118.0.63affected11.120.0.0 to < 11.124.0.35affected11.126.0.0 to < 11.126.0.54affected11.128.0.0 to < 11.130.0.19affected11.132.0.0 to < 11.132.0.29affected11.134.0.0 to < 11.134.0.20affected11.136.0.0 to < 11.136.0.5affected
References
- 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://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://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py ↗
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940 ↗
- https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/ ↗
- https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/ ↗