CVE-2026-41940
WebPros cPanel and WHM Authentication Bypass via Login Flow
- Published
- Updated
- Reserved
- Assigned by
- VulnCheck
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability.
- Added
- 30 Apr 2026
- Fix due (US federal)
- 3 May 2026
- Used by ransomware
- Known
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public exploit
A reference of the record is tagged as an exploit or proof of concept: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.
Timeline
ID reserved
By VulnCheck
- 7 days later
· 7 days later
Published
- 1 day later
· 1 day later
Added to CISA KEV
Known exploited, also by ransomware
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VulnCheckCNA (assigner) | 4.0 | Critical9.3 | 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 |
| VulnCheckCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 4.0 | Critical9.3 | 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 |
- EPSS (exploitation in 30 days)
- 98.5% · top 0.1% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.
Weakness
Affected products
- affected 11.40.0.0 – < 11.86.0.41
- affected 11.88.0.0 – < 11.94.0.28
- affected 11.96.0.0 – < 11.102.0.39
- affected 11.104.0.0 – < 11.110.0.97
- affected 11.112.0.0 – < 11.118.0.63
- affected 11.120.0.0 – < 11.124.0.35
- affected 11.126.0.0 – < 11.126.0.54
- affected 11.128.0.0 – < 11.130.0.19
- affected 11.132.0.0 – < 11.132.0.29
- affected 11.134.0.0 – < 11.134.0.20
- affected 11.136.0.0 – < 11.136.0.5
- affected < 11.136.1.7
- affected 11.40.0.0 – < 11.86.0.41
- affected 11.88.0.0 – < 11.94.0.28
- affected 11.96.0.0 – < 11.102.0.39
- affected 11.104.0.0 – < 11.110.0.97
- affected 11.112.0.0 – < 11.118.0.63
- affected 11.120.0.0 – < 11.124.0.35
- affected 11.126.0.0 – < 11.126.0.54
- affected 11.128.0.0 – < 11.130.0.19
- affected 11.132.0.0 – < 11.132.0.29
- affected 11.134.0.0 – < 11.134.0.20
- affected 11.136.0.0 – < 11.136.0.5
References (9)
- https://support.cpanel.net/hc/en-us/articles/40073787579671-cPanel-WHM-Security-Update-04-28-2026 (opens in a new tab)vendor-advisorypatch
- https://docs.cpanel.net/release-notes/release-notes (opens in a new tab)release-notes
- https://docs.wpsquared.com/changelogs/versions/changelog/#13617 (opens in a new tab)release-notes
- https://www.namecheap.com/status-updates/ongoing-critical-security-vulnerability-in-cpanel-april-28-2026 (opens in a new tab)third-party-advisory
- https://www.vulncheck.com/advisories/cpanel-and-whm-authentication-bypass-via-login-flow (opens in a new tab)third-party-advisory
- https://github.com/watchtowrlabs/watchTowr-vs-cPanel-WHM-AuthBypass-to-RCE.py (opens in a new tab)exploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940 (opens in a new tab)government-resource
- https://www.bleepingcomputer.com/news/security/critrical-cpanel-flaw-mass-exploited-in-sorry-ransomware-attacks/ (opens in a new tab)
- https://labs.watchtowr.com/the-internet-is-falling-down-falling-down-falling-down-cpanel-whm-authentication-bypass-cve-2026-41940/ (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-41940)Record last updated .