CVE-2025-52691 · netVigilance record NV26-0012
SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type
past due ransomware
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA deadline 2026-02-16 · passed 6 months ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
What happened
SmarterTools SmarterMail contains an unrestricted upload of file with dangerous type vulnerability that could allow an unauthenticated attacker to upload arbitrary files to any location on the mail server, potentially enabling remote code execution.
Who is affected
SmarterTools SmarterMail. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-434.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 6 months ago
Sources
- NVD entry for CVE-2025-52691 nvd.nist.gov/vuln/detail/CVE-2025-52691
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- smartertools.com www.smartertools.com/smartermail/release-notes/current
- csa.gov.sg www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2025-52691