CVE-2026-24423: SmarterTools SmarterMail

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

CVSS 9.3 CriticalCriticalIn CISA KEV · ransomwareEPSS 0.88 · 99th percentile

Critical, because:

In CISA’s KEV catalogue since 5 Feb 2026: it is known to be exploited.
CVSS score 9.3: 9.0 or more.
CVSS score 9.3 (7.0 or more) and EPSS 0.88 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the CVE Program (CNA: VulnCheck) at 23 Jan 2026, 16:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
SmarterTools	SmarterMail	affected before 100.0.9511 semver Other versions: unaffected

Identifiers

CVE-2026-24423

CNA

VulnCheck

Weakness (CWE)

CWE-306

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	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	CNA (VulnCheck)

CISA KEV Listed since 5 Feb 2026: known to be exploited. CISA reports use in ransomware campaigns.
EPSS 0.88, the 99th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 23 Jan 2026. New records show when each source confirmed them.

Sources

References from the CNA

www.smartertools.com/smartermail/release-notes/current release-notespatch
code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail third-party-advisory
www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.