CVE-2025-52691
SmarterTools — SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability
SmarterTools · CWE-434 — Unrestricted upload of dangerous file type · in CISA KEV since 2026-01-26
EVRS 93 of 100 Immediate
Out-of-Band / Urgent Remediation
Rank 100 of 2,960 tracked
Why it scores 93
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and associated with known ransomware campaigns.
- CISA KEVApplied
- RansomwareApplied
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyDid not apply
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
Patch or fixed version identifiedCISA required action
Fixed in
smartermail: update to 100.0.9413 or later
Affected versions
- smartermail
< 100.0.9413
Remediation
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Fixed versions from NVD.
Evidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 10.0 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.857 (99.73rd pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Known | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2026-02-16 · CISA federal deadline · Overdue by 8 months | CISA KEV |
| Public exploit moduleA module existing is not the same as active exploitation. | Public module exists | Metasploit |
| EUVD cross-referenceENISA's record: CVSS 10.0 (v3.1), assigned by CSA. | Listed | ENISA EUVD |
Description
NVDSuccessful 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.
What CISA says to do
Public module
Metasploit lists a public excellent-rank module for this CVE: SmarterTools SmarterMail GUID File Upload Vulnerability (multi/http/smartermail_guid_file_upload). A module existing is not the same as active exploitation; see metasploit.com.