CVE-2026-24423 kev+ ransomware in the critical feed json
SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API
published 2026-01-23 9 mo ago modified 2026-08-04 3 mo ago also EUVD-2026-4273
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Exploited
- added 2026-02-05, used in ransomware
- epss
- 88.2%
- EPSS 88.2% chance of exploitation in 30 days, percentile 99.7%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
cisa 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.
Timeline
- Published
- CISA SSVC: exploitation active
- Added to CISA KEV
- CISA patch deadline
Known exploited
- Added
- 9 mo ago
- Patch by
- 2026-02-26 (8 mo ago)
- Ransomware
- Known to be used in ransomware campaigns
- 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.
- Vendor, product
- SmarterTools, SmarterMail
- CISA name
- SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability
Ransomware
Groups reported to have exploited it in intrusions.
- Qilin ransomware gang
reported by ctrlaltintel.com
Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- 9 mo ago
Exploit prediction
88.18% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template SmarterMail - Remote Code Execution nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | 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 | 4.0 | 9.3 | 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 | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- SmarterTools SmarterMail
Classification
- Weakness
-
- CWE-306 Missing Authentication for Critical Functionality
References
-
smartertools.com
/smartermail/release-notes/current
release-notes, patch
-
code-white.com
/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail
third-party-advisory
-
vulncheck.com
/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api
third-party-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24423
government-resource, us-government-resource
Sources
- CVE List CVE-2026-24423
- NVD CVE-2026-24423
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.