What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-01-26
• EPSS: 85.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-29 · updated 2026-10-07
• Weakness: CWE-434

Description

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.

Affected products

• SmarterTools SmarterMail: before 100.0.9413 — fixed in 100.0.9413

How to fix

Upgrade to a fixed version: SmarterTools SmarterMail 100.0.9413. Check the vendor advisory for mitigations.

References

• https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/
• https://github.com/watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691?ref=labs.watchtowr.com
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-52691

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