Arbitrary file upload in SmarterMail - CVE-2025-52691
Published: January 14, 2026 / Updated: May 22, 2026
Vulnerability identifier: #VU121467
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2025-52691
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: SmarterTools Inc.
Affected software:
SmarterMail
SmarterMail
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to insufficient validation of file during file upload. A remote attacker can upload a malicious file and execute it on the server.
How to mitigate CVE-2025-52691
Install updates from vendor's website.