CVE-2026-24423Critical· 9.8▾ Hadal⚠ Exploited in the wildPoC availableSmarterTools 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 …
▾ Hadal zone — Critical and actively exploited (CISA KEV / 0day)
impact 53.9 · likelihood 17.6 · exploitation 25 · ransomware 5
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 2 sources. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Federal remediation due Feb 26, 2026
Last analysed / modified upstream
88%
2 GitHub repos · Nuclei ×1
88% → 88%
Added to the CISA catalog on Feb 5, 2026. Federal remediation due Feb 26, 2026. View catalog ↗
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.
smartermail < 100.0.9511Upgrade past the affected range:
smartermail 100.0.9511Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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