CVE-2025-52691—SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability

Vulnerability Name

SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability

Description

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

KNOWN

Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Additional Notes

• https://www.smartertools.com/smartermail/release-notes/current
• https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/
• https://nvd.nist.gov/vuln/detail/CVE-2025-52691

Related News Articles

• Iran-Linked Hackers Use New Cavern C2 Framework to Target Israeli OrganizationsJuly 6, 2026
• China-Linked Storm-1175 Exploits Zero-Days to Rapidly Deploy Medusa RansomwareApril 7, 2026
• Microsoft links Medusa ransomware affiliate to zero-day attacksApril 6, 2026
• Warlock Ransomware Breaches SmarterTools Through Unpatched SmarterMail ServerFebruary 10, 2026
• Over 6,000 SmarterMail servers exposed to automated hijacking attacks January 27, 2026

Related Weaknesses

• CWE-434