SmarterTools SmarterMail unrestricted upload

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.6$0-$5k0.00

Summaryinfo

A vulnerability was found in SmarterTools SmarterMail. It has been declared as critical. This affects an unknown function. The manipulation results in unrestricted upload. This vulnerability is known as CVE-2025-52691. It is possible to launch the attack remotely. Furthermore, an exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in SmarterTools SmarterMail (version now known). Affected is some unknown processing. The manipulation with an unknown input leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was published by Chua Meng Han. The advisory is available at csa.gov.sg. This vulnerability is traded as CVE-2025-52691 since 06/19/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but an exploit is available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/21/2026). This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 297222 (SmarterMail < 100.0.9413 Unrestricted File Upload Remote Code Execution (CVE-2025-52691)), which helps to determine the existence of the flaw in a target environment. This issue was added on 01/26/2026 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 02/16/2026:

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (297222), EUVD (EUVD-2025-205544) and CERT Bund (WID-SEC-2026-0007). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • SmarterTools SmarterMail

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.6
VulDB Meta Temp Score: 8.6

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 10.0
CNA Vector (CSA): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Unrestricted upload
CWE: CWE-434 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Attacked

EPSS Score: 🔒
EPSS Percentile: 🔒

KEV Added: 🔒
KEV Due: 🔒
KEV Remediation: 🔒
KEV Ransomware: 🔒
KEV Notice: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 297222
Nessus Name: SmarterMail < 100.0.9413 Unrestricted File Upload Remote Code Execution (CVE-2025-52691)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/19/2025 CVE reserved
12/29/2025 +193 days Advisory disclosed
12/29/2025 +0 days VulDB entry created
04/21/2026 +113 days VulDB entry last update

Sourcesinfo

Advisory: csa.gov.sg
Researcher: Chua Meng Han
Status: Confirmed

CVE: CVE-2025-52691 (🔒)
GCVE (CVE): GCVE-0-2025-52691
GCVE (VulDB): GCVE-100-338610
EUVD: 🔒
CERT Bund: WID-SEC-2026-0007 - SmarterTools SmarterMail: Schwachstelle erm&ouml;glicht Codeausf&uuml;hrung

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 12/29/2025 08:35
Updated: 04/21/2026 22:06
Changes: 12/29/2025 08:35 (61), 12/29/2025 12:22 (1), 01/09/2026 23:15 (6), 01/27/2026 00:01 (15), 01/31/2026 03:52 (2), 04/21/2026 22:06 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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