Upload Arbitrary Files

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-52691
StatePUBLISHED
AssignerCSA
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-29 03:15:42 UTC
Updated2026-10-07 12:10:00 UTC
DescriptionSuccessful 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.

Risk And Classification

Primary CVSS: v3.1 10 CRITICAL from 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.856550000 probability, percentile 0.997210000 (date 2026-10-08)

CISA KEV: Listed on 2026-01-26; due 2026-02-16; ransomware use Known

Problem Types: CWE-434 | CWE-434 CWE-434 Unrestricted Upload of File with Dangerous Type

VersionSourceTypeScoreSeverityVector
3.15f57b9bf-260d-4433-bf07-b6a79e9bb7d4Secondary10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1CNACVSS10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA Known Exploited Vulnerability

VendorSmarterTools
ProductSmarterMail
NameSmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability
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.
Noteshttps://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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Smartertools Smartermail All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SmarterTools SmarterMail affected SmarterMail versions Build 9406 and earlier Not specified

References

ReferenceSourceLinkTags
github.com/watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Third Party Advisory
www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4 www.csa.gov.sg Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Vendor Comments And Credit

Discovery Credit

CNA: Chua Meng Han (en)

Additional Advisory Data

Solutions

CNA: Users and administrators of affected product versions are advised to update to SmarterMail version Build 9413 immediately.

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