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CVE-2026-24423 is a critical unauthenticated remote code execution vulnerability in SmarterTools SmarterMail affecting versions prior to build 9511. The flaw is in the ConnectToHub API method and is caused by a missing authentication check on a critical function. A remote attacker can invoke this API without valid credentials and direct the SmarterMail instance to connect to an attacker-controlled HTTP service. By supplying a malicious OS command through that remote service, the attacker can cause the vulnerable application to execute arbitrary operating system commands on the underlying server.
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3 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos.
The repository contains one executable Python file (MalHub.py) and a supporting README. It is a standalone, operational proof-of-concept for CVE-2026-24423, described as an unauthenticated SmarterTools SmarterMail ConnectToHub remote-code-execution issue affecting builds before 100.0.9511. MalHub.py starts an HTTP server on port 8081 and exclusively handles POST requests to /web/api/node-management/setup-initial-connection. Its response supplies a forged cluster/setup JSON structure containing SystemMount.CommandMount set to a Base64-encoded, hidden PowerShell command. The decoded PowerShell establishes a command-capable reverse TCP shell to the hardcoded attacker address 10.10.14.50 on port 4455. The script does not itself invoke the target's ConnectToHub endpoint and does not implement a TCP listener; an operator must separately cause the target to use the attacker hub and receive the callback. No exploit framework is used. The README documents the purported vulnerable target endpoint, affected version range, exploitation flow, and mitigation guidance.
The repository contains one executable Python proof-of-concept, MalHub.py, and a detailed README. It targets the claimed SmarterTools SmarterMail ConnectToHub unauthenticated RCE (CVE-2026-24423) on versions before build 9511. MalHub.py is not a complete initial-access client: it does not call the target's /api/v1/settings/sysadmin/connect-to-hub endpoint. Instead, it implements the attacker-side fake hub required after an operator causes a vulnerable SmarterMail server to connect to it. The server listens on TCP/8081 and only accepts POST requests for /web/api/node-management/setup-initial-connection. It responds with JSON containing SystemMount.Enabled=true, a writable Windows Temp mount path, and CommandMount set to a base64-encoded hidden PowerShell reverse-shell command. The embedded PowerShell payload connects back to the hardcoded 10.10.14.50:4455, executes received commands via iex, and sends command output to the attacker. This is an operational but environment-specific PoC: callback address, ports, and payload are hardcoded, and a separate TCP listener plus an external mechanism to invoke ConnectToHub are necessary.
Repository purpose: a minimal proof-of-concept to reproduce CVE-2026-24423 in SmarterMail’s ConnectToHub workflow by standing up an attacker-controlled “Hub” HTTP service and then triggering the victim’s unauthenticated connect-to-hub API so the victim SSRFs to the hub and consumes a malicious JSON response. Structure: - CVE-2026-24423.py: Python3 HTTP server (http.server) that listens on 0.0.0.0:80 and only responds to POST /web/api/node-management/setup-initial-connection. It logs the received request body and returns a crafted JSON object containing fields like ClusterID/SharedSecret and, critically, SystemMount with MountPath "C:\\" and CommandMount "whoami > C:\\whoami.txt". This models the trust-boundary violation where the victim treats hub-provided configuration as authoritative and performs system-level actions. - README.md: Explains the vulnerability chain (unauthenticated admin interface + SSRF to attacker hub + hub response used for local operations → potential RCE). Provides a sample request to POST /api/v1/settings/sysadmin/connect-to-hub with hubAddress pointing to the attacker server. Exploit capabilities: - Acts as the attacker-controlled hub endpoint to deliver a malicious configuration payload. - Demonstrates a command-execution outcome (example Windows command writing whoami output to C:\\whoami.txt) if the target is vulnerable. Notes: - This repo does not include an automated client to send the trigger request; it relies on manual tooling (Burp/Yakit) per README. - The payload is hardcoded and Windows-oriented (C:\\ paths, cmd redirection).
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93 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A referenced SmarterMail ConnectToHub remote code execution vulnerability/template.
An unauthenticated remote code execution vulnerability in SmarterTools SmarterMail via the ConnectToHub API, where missing authentication allows remote attackers to trigger OS command execution.
A second SmarterMail vulnerability (described as a critical RCE bug in the article) that CISA warns is under active exploitation and can also lead to full system compromise.
SmarterMail unauthenticated RCE in the ConnectToHub API (pre-build 9511).
Query your assets running an affected version, and investigate the blast radius.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.