TI-2025-32755 Aliases CVE-2025-52691 GHSA-c9vj-8fwr-4gvq

Upload arbitrary files in SmarterTools SmarterMail

CRITICAL 100Exploited in the wildCWE-434Published 2025-12-29 · Updated 2026-02-26

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2026-01-26CISA due date 2026-02-16Known ransomware use

EPSS 0.85655 99th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
SmarterTools	SmarterMail	SmarterMail versions Build 9406 and earlier	—	No fix listed	CNA

SmarterMail VendorSmarterTools Affected SmarterMail versions Build 9406 and earlier Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:smartertools:smartermail::::::::	before 100.0.9413	Vulnerable	SmarterTools

cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:* Versions before 100.0.9413 Vulnerable ·SmarterTools

Remediation

No fixed version listed by the sources yet.

Timeline

2026-01-26 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2025-52691
2026-10-03 Alias added: GHSA-c9vj-8fwr-4gvq

References

Exploit 1

https://github.com/watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691?ref=labs.watchtowr.com

Advisory 1

https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/

TI-2026-19690 SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API KEVCVSS 4.0CRITICAL 9.3
TI-2026-19133 SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API KEVCVSS 4.0CRITICAL 9.3
TI-2019-05110 SmarterTools SmarterMail 16.x before build 6985 allows deserialization of untrusted data. CVSS 3.0CRITICAL 9.8
TI-2019-05109 SmarterTools SmarterMail 16.x before build 6985 allows directory traversal. CVSS 3.0MEDIUM 6.5
TI-2021-12079 SmarterTools SmarterMail 16.x through 100.x before 100.0.7803 allows remote code execution. CVSS 3.1CRITICAL 9.8
TI-2026-06870 SmarterTools SmarterMail < Build 9560 Server Local File Inclusion via the /api/v1/report/summary/{type} API CVSS 4.0HIGH 8.7

See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences