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ExploitedIn CISA KEVFix available

CVE-2026-24423

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

Exploitation confirmed. First attested on 2026-02-05 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2026-01-23
  • Fixed in100.0.9511
  • WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-01-2317:16CVE publishedNVD
  2. 2026-02-05Added to the CISA KEV catalogCISA KEV
  3. 2026-02-05Listed as exploited by GCVEGCVE
  4. 2026-02-05Exploitation first reportedCISA KEV
  5. 2026-02-0604:55SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD
Smartertools smartermail
BranchAffectedFixed in
100.0< 100.0.9511100.0.9511

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As VulnCheck, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • SmarterTools SmarterMailother versions: not affected
    Affected
    • < 100.0.9511fixed in 100.0.9511semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-05

Fix

  1. Update Smartertools smartermail to 100.0.9511
  2. CISA’s 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 2026-02-26

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2026-02-05
Patch Due Date
2026-02-26
Ransomware Use
Known
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.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 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
Published
2026-01-23
Last Modified
2026-08-04
NVD status
Analyzed
GitHub Advisory
GHSA-7jpw-fm5p-f98m

Frequently asked questions

What is CVE-2026-24423?

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.

Is CVE-2026-24423 actively exploited?

Yes. CVE-2026-24423 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-02-26.

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

CVE-2026-24423 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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