SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability

SmarterTools SmarterMail

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. Can be chained with CVE-2026-23760. Added to CISA KEV on 2026-01-26 (federal deadline 2026-02-16).

First seen: 26 Jan 2026
Last update: 26 Jan 2026, 12:00 UTC
Identifiers: CVE-2025-52691
CVE-2026-23760
Source: CISA KEV
On the menu as: Enterprise apps

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability
Severity: critical, exploited in the wild. Patch status: patched.
Affected: SmarterTools SmarterMail
Ids: CVE-2025-52691, CVE-2026-23760

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. Can be chained with CVE-2026-23760. Added to CISA KEV on 2026-01-26 (federal deadline 2026-02-16).

## Steps
1. This touches infrastructure (erp). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2025-52691") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://nvd.nist.gov/vuln/detail/CVE-2025-52691 https://nvd.nist.gov/vuln/detail/CVE-2026-23760 https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/ https://www.smartertools.com/smartermail/release-notes/current
https://pwned.coffee/i/smartertools-smartermail-unrestricted-upload-of-file-with-dangerous-type

Sources

Totalone very hot coffee