ACTIVELY EXPLOITED
CVE-2025-52691: SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability
| Vendor | SmarterTools |
|---|---|
| Product | SmarterMail |
| Actively exploited | Yes |
| Added to CISA KEV | 26 Jan 2026 |
| CISA federal deadline | 16 Feb 2026 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-434 |
Required action (CISA's text)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description (NVD)
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.
SOURCES
Other SmarterTools flaws
- CVE-2026-24423: SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability
- CVE-2026-23760: SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.