[ CVE-2026-41940 · Published 29 Apr 2026 ]
WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-04-30
- Known to be used in ransomware campaigns
- EPSS: 99% chance of exploitation in the next 30 days (higher than 100% of CVEs)
- Critical severity: CVSS 9.8
[ Description ]Official 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.
CISA: 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.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 3 May 2026): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ References ]References
- docs.cpanel.net/release-notes/release-notesRelease Notes
- docs.wpsquared.com/changelogs/versions/changelogRelease Notes
- support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026Vendor Advisory
- www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-apri…Third Party Advisory
- www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flowThird Party Advisory
- labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-au…ExploitThird Party Advisory
- www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ra…Press/Media Coverage
- github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.pyExploitThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource