All vulnerabilities
CVE-2025-52691

SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability

SmarterTools SmarterMail
Open in ThreatlineRecord JSON
CVSS
10.0Critical
ExploitationExploited in the wildAdded to KEV 26 Jan 2026. Known ransomware useCISA KEV
Exploit odds (EPSS)85.7%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline16 Feb 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 9 Oct 2025Exploit code publicMetasploit
  2. 29 Dec 2025, 02:15 UTCPublishedCVE List
  3. 26 Jan 2026Added to CISA KEVCISA KEV

Public exploit code and templates 2

  • Exploit moduleSmarterTools SmarterMail GUID File Upload Vulnerability 9 Oct 2025Metasploit
  • Scanner templateSmarterMail - Unrestricted File UploadNuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

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.

Text from CVE List

Affected versions 1

  • SmarterMailaffected: SmarterMail versions Build 9406 and earlierCVE List

References 5