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NVD / CVE Program· CNA VulnCheck

CVE-2026-41940: WebPros cPanel and WHM Authentication Bypass via Login Flow

Noroxi assessment

Priority: Now (action score 97/100)

  • CISA has confirmed exploitation in the wild (Apr 30, 2026); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: May 3, 2026.
  • A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 98.5% (FIRST EPSS); higher than 99.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

CriticalCVSS 9.3 · v4.0KEVWeaponized No fix recorded
Published
Apr 29, 2026
Updated
Oct 26, 2026
EPSS
98.5% · 99th percentile

Report tools

JSON

Action score

97

Now

Patch today or shut off access.

CVSS
37 / 40 · 9.3 / 10
CISA KEV
30 / 30 · Listed
EPSS
30 / 30 · 98.5%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
9.3
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Apr 30, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: May 3, 2026.

Known to be used in ransomware campaigns.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-41940

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
cpanelcpanel
cpanelwhm
cpanelwp squared

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • cpanel cpanel11.40 and later · before 86.0.41
  • cpanel cpanel88.0.0 and later · before 110.0.97
  • cpanel cpanel112.0.0 and later · before 118.0.63
  • cpanel cpanel120.0.0 and later · before 124.0.35
  • cpanel cpanel126.0.1 and later · before 126.0.54
  • cpanel cpanel128.0.0 and later · before 130.0.19
  • cpanel cpanel132.0.0 and later · before 132.0.29
  • cpanel cpanel134.0.0 and later · before 134.0.20
  • cpanel cpanel136.0.0 and later · before 136.0.5
  • cpanel whm11.40 and later · before 86.0.41
  • cpanel whm88.0.0 and later · before 110.0.97
  • cpanel whm112.0.0 and later · before 118.0.63
  • cpanel whm120.0.0 and later · before 124.0.35
  • cpanel whm126.0.1 and later · before 126.0.54
  • cpanel whm128.0.0 and later · before 130.0.19
  • cpanel whm132.0.0 and later · before 132.0.29
  • cpanel whm134.0.0 and later · before 134.0.20
  • cpanel whm136.0.0 and later · before 136.0.5
  • cpanel wp squaredbefore 136.1.7

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • WebPros cPanel

    • 11.40.0.0 and later · before 11.86.0.41affected
    • 11.88.0.0 and later · before 11.94.0.28affected
    • 11.96.0.0 and later · before 11.102.0.39affected
    • 11.104.0.0 and later · before 11.110.0.97affected
    • 11.112.0.0 and later · before 11.118.0.63affected
    • 11.120.0.0 and later · before 11.124.0.35affected
    • 11.126.0.0 and later · before 11.126.0.54affected
    • 11.128.0.0 and later · before 11.130.0.19affected
    • 11.132.0.0 and later · before 11.132.0.29affected
    • 11.134.0.0 and later · before 11.134.0.20affected

  • WebPros WHM

    • 11.40.0.0 and later · before 11.86.0.41affected
    • 11.88.0.0 and later · before 11.94.0.28affected
    • 11.96.0.0 and later · before 11.102.0.39affected
    • 11.104.0.0 and later · before 11.110.0.97affected
    • 11.112.0.0 and later · before 11.118.0.63affected
    • 11.120.0.0 and later · before 11.124.0.35affected
    • 11.126.0.0 and later · before 11.126.0.54affected
    • 11.128.0.0 and later · before 11.130.0.19affected
    • 11.132.0.0 and later · before 11.132.0.29affected
    • 11.134.0.0 and later · before 11.134.0.20affected

  • WebPros WP Squared

    • before 11.136.1.7affected

Same product

cpanel: all records

Other highest-scoring records for the same primary product.

  • CVE-2004-1769The "Allow cPanel users to reset their password via email" feature in cPanel 9.1.0 build 34 and earlier, including 8.x, allows remote attack
    50Plan
  • CVE-2023-29489An issue was discovered in cPanel before 11.109.9999.116.
    44Plan
  • CVE-2004-1770The login page for cPanel 9.1.0, and possibly other versions, allows remote attackers to execute arbitrary code via shell metacharacters in
    43Plan

Published before and after this one in the same product

  • ← EarlierCVE-2021-38590Aug 11, 2021 · In cPanel before 96.0.8, weak permissions on web stats can lead to information disclosure (SEC-584).
    22Monitor
  • ← EarlierCVE-2025-66429Dec 11, 2025 · An issue was discovered in cPanel 110 through 132.
    35Monitor
  • Later →CVE-2026-29205May 13, 2026 · Incorrect privileges management and insufficient path filtering allow to read arbitrary file on the server via the cpdavd attachment downloa
    37Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Exploit-DB entry ×1
  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×50

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrywebapps2026-05-26
Metasploit moduleexploit/multi/http/cpanel_whm_auth_bypass_rcecPanel/WHM CRLF Injection Authentication Bypass RCEexploit2026-04-28
Nuclei detection templateNuclei template CVE-2026-41940 —
Proof-of-concept repository on GitHubstars:262026-04-29
Proof-of-concept repository on GitHubstars:62026-04-29
Proof-of-concept repository on GitHubstars:282026-04-30
Proof-of-concept repository on GitHubstars:102026-04-30
Proof-of-concept repository on GitHubstars:02026-04-30
Proof-of-concept repository on GitHubstars:932026-04-30
Proof-of-concept repository on GitHubstars:122026-04-30
Proof-of-concept repository on GitHubstars:132026-04-30
Proof-of-concept repository on GitHubstars:132026-04-30

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-2 d
  2. First PoC-1 d
  3. Published
  4. CISA KEVsame day
  5. TodayNov 3, 2026+188 d
EPSS, last 120 days+1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2025-66429139 days apartAn issue was discovered in cPanel 110 through 132.
    35Monitor
  • CVE-2026-65643125 days apartEval injection in cPanel 11.138.0.0 and earlier allows remote authenticated users to execute arbitrary code as root.
    34Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

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

nvd-secondary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
// Added for the support teamapp.post("/maintenance/reset", resetDevice);

Fixed

ts
if (config.maintenanceEnabled) {  app.post(    "/maintenance/reset",    requireSession, requireRole("admin"), resetDevice  );}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records