Remote Code Execution Vulnerability in Mail Server Product by Vendor
CVE-2025-52691

10CRITICAL

Key Information:

Vendor: Smartertools
Status: Smartermail
Vendor: CVE Published:; 29 December 2025

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📈 Trended📈 Score: 2,780👾 Exploit Exists🟡 Public PoC🟣 EPSS 79%🦅 CISA Reported📰 News Worthy

What is CVE-2025-52691?

CVE-2025-52691 is a critical vulnerability identified in a mail server product developed by Smartertools. This vulnerability enables unauthenticated attackers to upload arbitrary files to any location on the mail server, putting organizations at significant risk. The core issue stems from a flaw that lacks proper input validation and file handling, which could lead to remote code execution. If exploited, this vulnerability allows an attacker to execute malicious code on the server, potentially compromising sensitive data and disruptively altering server operations. Given the critical role that email servers play in organizational communications and operations, the impacts of such a vulnerability could be extensive and damaging.

Potential impact of CVE-2025-52691

Remote Code Execution: The most significant impact of CVE-2025-52691 is the potential for remote code execution, allowing an attacker to run arbitrary code on the mail server. This could lead to unauthorized access to sensitive information, including emails and attachments, and enable further attacks within the organization’s network.
Data Breach Risk: The ability to upload files and execute code could lead to severe data breaches. Attackers could steal sensitive data hosted on the mail server, including personal information and proprietary business data, which could result in substantial financial loss and reputational damage.
Disruption of Services: Successful exploitation of this vulnerability could lead to service disruptions, as attackers might manipulate server functionality or launch subsequent attacks, such as denial-of-service (DoS). This disruption impacts not only internal operations but also external communications, affecting the overall business continuity of the organization.

CISA has reported CVE-2025-52691

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2025-52691 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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Affected Version(s)

SmarterMail SmarterMail versions Build 9406 and earlier

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-52691-PoC-SmarterMail-authentication-bypass-exploit-WT-2026-0001
Created by ninjazan420

CVE-2025-52691-APT-PoC
Created by DeathShotXD