CVE-2026-41940

Q: How do I fix CVE-2026-41940?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2026-41940 being actively exploited?

Yes. CVE-2026-41940 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. CISA has also linked it to known ransomware campaigns. US federal agencies were required to remediate it by 2026-05-03. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2026-41940?

CVE-2026-41940 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-41940 affect?

Published advisories record a fix for cpanel (NVD), whm (NVD), wp squared (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

cpanelNVD

Affected:>= 136.0.0, < 136.0.5Fixed in:136.0.5CVE-2026-41940derived from NVD

whmNVD

Affected:>= 136.0.0, < 136.0.5Fixed in:136.0.5CVE-2026-41940derived from NVD

wp squaredNVD

Affected:< 136.1.7Fixed in:136.1.7CVE-2026-41940derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

97.93%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-05-03

Associated with ransomware campaigns

References

Exploit2

Vendor Advisory1

support.cpanel.net

Third-Party Advisory2

Government Resource1

cisa.gov

Release Notes2

Press / Media1

bleepingcomputer.com

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-3248	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2026-33017	Critical	9.8	100%	KEV	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-

Common questions

How do I fix CVE-2026-41940?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-41940 being actively exploited?

Yes. CVE-2026-41940 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. CISA has also linked it to known ransomware campaigns. US federal agencies were required to remediate it by 2026-05-03. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2026-41940?

CVE-2026-41940 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-41940 affect?

Published advisories record a fix for cpanel (NVD), whm (NVD), wp squared (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-04.