Is CVE-2026-24423 in the CISA KEV catalog?

Yes. CVE-2026-24423 is on the CISA Known Exploited Vulnerabilities list, added 2026-02-05, and has known ransomware campaign use.

What is the CVSS severity of CVE-2026-24423?

CVE-2026-24423 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2026-24423?

CVE-2026-24423 has an EPSS score of 87.69% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-24423?

Upgrade smartermail to 100.0.9511 or later.

CVE & CISA-KEV Catalog

CVE-2026-24423

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

Description

SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the vulnerable application.

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

smartermailNVD

Affected:< 100.0.9511Fixed in:100.0.9511CVE-2026-24423derived 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

87.69%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: 2026-02-26

Associated with ransomware campaigns

References

Third-Party Advisory2

Government Resource1

cisa.gov

Release Notes1

smartertools.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-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2025-3248	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

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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 2026-02-06.