Overview
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.
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
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2025-52691 |
| Vendor / Product | SmarterTools — SmarterMail |
| NVD Published | 2025-12-29 |
| NVD Last Modified | 2026-01-27 |
| CVSS 3.1 Score | 10 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| Severity | CRITICAL |
| CWE | CWE-434 |
| CISA KEV Added | 2026-01-26 |
| CISA KEV Deadline | 2026-02-16 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2026-02-16.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2026-01-26 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2026-02-16 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2025-52691 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |