CVE-2026-41940 (GCVE-0-2026-41940)
Vulnerability from cvelistv5 – Published: 2026-04-29 15:10 – Updated: 2026-09-30 17:20Title
WebPros cPanel and WHM Authentication Bypass via Login Flow
Summary
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.
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-29 00:00 UTC
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://support.cpanel.net/hc/en-us/articles/4007… | vendor-advisorypatch |
| https://docs.cpanel.net/release-notes/release-notes | release-notes |
| https://docs.wpsquared.com/changelogs/versions/ch… | release-notes |
| https://www.namecheap.com/status-updates/ongoing-… | third-party-advisory |
| https://www.vulncheck.com/advisories/cpanel-and-w… | third-party-advisory |
| https://github.com/watchtowrlabs/watchTowr-vs-cPa… | exploit |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
| https://www.bleepingcomputer.com/news/security/cr… | |
| https://labs.watchtowr.com/the-internet-is-fallin… |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| WebPros | cPanel |
Affected:
11.40.0.0 , < 11.86.0.41
(custom)
Affected: 11.88.0.0 , < 11.94.0.28 (custom) Affected: 11.96.0.0 , < 11.102.0.39 (custom) Affected: 11.104.0.0 , < 11.110.0.97 (custom) Affected: 11.112.0.0 , < 11.118.0.63 (custom) Affected: 11.120.0.0 , < 11.124.0.35 (custom) Affected: 11.126.0.0 , < 11.126.0.54 (custom) Affected: 11.128.0.0 , < 11.130.0.19 (custom) Affected: 11.132.0.0 , < 11.132.0.29 (custom) Affected: 11.134.0.0 , < 11.134.0.20 (custom) Affected: 11.136.0.0 , < 11.136.0.5 (custom) |
|
| WebPros | WP Squared |
Affected:
0 , < 11.136.1.7
(custom)
|
|
| WebPros | WHM |
Affected:
11.40.0.0 , < 11.86.0.41
(custom)
Affected: 11.88.0.0 , < 11.94.0.28 (custom) Affected: 11.96.0.0 , < 11.102.0.39 (custom) Affected: 11.104.0.0 , < 11.110.0.97 (custom) Affected: 11.112.0.0 , < 11.118.0.63 (custom) Affected: 11.120.0.0 , < 11.124.0.35 (custom) Affected: 11.126.0.0 , < 11.126.0.54 (custom) Affected: 11.128.0.0 , < 11.130.0.19 (custom) Affected: 11.132.0.0 , < 11.132.0.29 (custom) Affected: 11.134.0.0 , < 11.134.0.20 (custom) Affected: 11.136.0.0 , < 11.136.0.5 (custom) |
Date Public
2026-04-28 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 98ba4739-aacb-4463-ac1e-3ce8bda9c81c
Exploited: Yes
Timestamps
First Seen: 2026-04-30
Asserted: 2026-04-30
Scope
Notes: WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability | Affected: WebPros / cPanel & WHM and WP2 (WordPress Squared) | Description: 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. | 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. | Due date: 2026-05-03 | Known ransomware campaign use (KEV): Known | Notes (KEV): 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://nvd.nist.gov/vuln/detail/CVE-2026-41940"
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-306 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | cPanel & WHM and WP2 (WordPress Squared) |
| Due Date | 2026-05-03 |
| Date Added | 2026-04-30 |
| Vendorproject | WebPros |
| Vulnerabilityname | WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-10-02 08:09 CEST
| Updated: 2026-10-02 08:09 CEST
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 5f80298b-a3f6-4691-af7d-16426dc1e985
Exploited: Yes
Timestamps
First Seen: 2026-05-08
Asserted: 2026-05-08
Scope
Notes: Affected: WebPros / cPanel | 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. | Patched since: 2026/04/28 | Exploitation type: ransomware | CWEs: CWE-306 | Origin source: CERT-PL | Notes: https://support.cpanel.net/hc/en-us/articles/40073787579671-Security-CVE-2026-41940-cPanel-WHM-WP2-Security-Update-04-28-2026
Evidence
Type: Csirt Report
Signal: Confirmed Compromise
Confidence: 75%
Source: enisa-cnw-kev
Details
| Cwes | CWE-306 |
|---|---|
| Euvd | EUVD-2026-26246 |
| Notes | https://support.cpanel.net/hc/en-us/articles/40073787579671-Security-CVE-2026-41940-cPanel-WHM-WP2-Security-Update-04-28-2026 |
| Catalog | ENISA / EU CSIRTs Network (CNW) KEV JSON |
| Product | cPanel |
| Datereported | 2026/05/08 |
| Originsource | CERT-PL |
| Patchedsince | 2026/04/28 |
| Vendorproject | WebPros |
| Exploitationtype | ransomware |
| Vulnerabilityname | |
| Threatactorsexploiting |
References
Created: 2026-10-02 08:52 CEST
| Updated: 2026-10-02 08:52 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3fb2c5f6-9baa-4ca4-8c3d-433ce1cfbf41
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: WebPros cPanel and WHM Authentication Bypass via Login Flow | Affected: WebPros / cPanel, WP Squared, WHM | CVSS: 9.3 (CRITICAL) | EPSS: 0.98527 | Used in malware: yes | Listed 1 day ahead of CISA KEV | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | WebPros cPanel and WHM Authentication Bypass via Login Flow |
| Cve Id | CVE-2026-41940 |
| Vendor | WebPros |
| Ghsa Id | None |
| Product | cPanel, WP Squared, WHM |
| Added Date | 2026-06-01T00:00:00.000Z |
| Cvss Score | 9.3 |
| Epss Score | 0.98527 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.9992 |
| Used In Malware | yes |
| Vulnerability Id | CVE-2026-41940 |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:09 CEST
| Updated: 2026-10-02 09:09 CEST
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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