CVE-2025-52691 is a vulnerability in Smartertools Smartermail
Published on December 29, 2025
Upload Arbitrary Files
Successful exploitation of the vulnerability could allow an unauthenticated attacker to upload arbitrary files to any location on the mail server, potentially enabling remote code execution.
Known Exploited Vulnerability
This SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. SmarterTools SmarterMail contains an unrestricted upload of file with dangerous type vulnerability that could allow an unauthenticated attacker to upload arbitrary files to any location on the mail server, potentially enabling remote code execution.
The following remediation steps are recommended / required by February 16, 2026: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vulnerability Analysis
CVE-2025-52691 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is an Unrestricted File Upload Vulnerability?
The software allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment.
CVE-2025-52691 has been classified to as an Unrestricted File Upload vulnerability or weakness.
Products Associated with CVE-2025-52691
Want to know whenever a new CVE is published for Smartertools Smartermail? stack.watch will email you.
Affected Versions
SmarterTools SmarterMail Version SmarterMail versions Build 9406 and earlier is affected by CVE-2025-52691Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.