Type Vulnerability
A vulnerability in SmarterTools SmarterMail allows unauthenticated access to critical functions, according to claims. Known-exploited catalogue reports exploitation in the wild.
Smartertools
SmarterTools SmarterMail Missing Authentication Vulnerability
CVE-2026-24423
What this means
This is rated critical severity (9.3 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Smartertools Smartermail is in your estate, and treat that as the priority.
Full vendor 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.
Scoring and exploitation
9.3/ 10
CVSS 4.0 base scoreCritical
Exploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality, integrity and availability.
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
Exploitability
Longer bar: easier to attack
Attack vectorNetworkAV:N
Attack complexityLowAC:L
Attack requirementsNoneAT:N
Privileges requiredNonePR:N
User interactionNoneUI:N
Impact
Longer bar: more harm
ConfidentialityHighVC:H
IntegrityHighVI:H
AvailabilityHighVA:H
- Elevated attack likelihood (~88.2% in 30 days)Model estimate (): a probability signal, not confirmed exploitation
- Exploited in the wild
- Yes — confirmed exploitation (US CISA )
- Known
- Listed product
- SmarterTools SmarterMail
Weaknesses
CWE-306
Affected products ()
- Smartertools Smartermail
Show the raw CPE strings (1)
- cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:*
References
4 links from the CVE record, grouped by site.
code-white.com1 link
- public-vulnerability-list (opens in a new tab)Third Party Advisory
smartertools.com1 link
- current (opens in a new tab)Release Notes
vulncheck.com1 link
cisa.gov1 link
- known-exploited-vulnerabilities-catalog (opens in a new tab)US Government Resource