Security Digest · Vulnerability record · Known exploited
CVE-2026-41940: WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability
Exploited in the wild (CISA KEV). 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 KEV · added 2026-04-30 CVSS 9.3 Critical EPSS 98.5% · p99.9
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run WebPros cPanel & WHM and WP2 (WordPress Squared). CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-04-30, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-05-03; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns.
- EPSS 98.5%, percentile 99.9: FIRST’s model estimates a 98.5% chance of exploitation activity in the next 30 days, higher than 99.9% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
What it is
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’s summary
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.
Weakness type: CWE-306.
Product: WebPros cPanel & WHM and WP2 (WordPress Squared) · Assigned by: VulnCheck · Published: 2026-04-29
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| WebPros | cPanel | 11.40.0.0 < 11.86.0.41, 11.88.0.0 < 11.94.0.28, 11.96.0.0 < 11.102.0.39, 11.104.0.0 < 11.110.0.97, 11.112.0.0 < 11.118.0.63, 11.120.0.0 < 11.124.0.35, 11.126.0.0 < 11.126.0.54, 11.128.0.0 < 11.130.0.19, 11.132.0.0 < 11.132.0.29, 11.134.0.0 < 11.134.0.20, 11.136.0.0 < 11.136.0.5 |
| WebPros | WP Squared | < 11.136.1.7 |
| WebPros | WHM | 11.40.0.0 < 11.86.0.41, 11.88.0.0 < 11.94.0.28, 11.96.0.0 < 11.102.0.39, 11.104.0.0 < 11.110.0.97, 11.112.0.0 < 11.118.0.63, 11.120.0.0 < 11.124.0.35, 11.126.0.0 < 11.126.0.54, 11.128.0.0 < 11.130.0.19, 11.132.0.0 < 11.132.0.29, 11.134.0.0 < 11.134.0.20, 11.136.0.0 < 11.136.0.5 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VulnCheck | 4.0 | 9.3 Critical | 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 |
| VulnCheck | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2026-04-30; federal due date 2026-05-03. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 98.53% probability of exploitation activity in the next 30 days; percentile 99.9.
Timeline
- — CVE record published by VulnCheck
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- support.cpanel.net support.cpanel.net
- docs.cpanel.net docs.cpanel.net
- docs.wpsquared.com docs.wpsquared.com
Vulnerability records
- CVE.org record CVE-2026-41940 cve.org
- NVD entry CVE-2026-41940 nvd.nist.gov
Government
- CISA Known Exploited Vulnerabilities catalog entry cisa.gov
- Listed in CISA KEV notes (nvd.nist.gov) nvd.nist.gov
Other references from the CVE record and advisory
- namecheap.com namecheap.com
- vulncheck.com vulncheck.com
- github.com github.com
- bleepingcomputer.com bleepingcomputer.com
- labs.watchtowr.com labs.watchtowr.com
All exploited WebPros vulnerabilities · Today’s Security Digest