SmarterMail is an email/collaboration suite of tools positioned as a Microsoft Exchange alternative, offering native MAPI support, supposedly making it easy as a drop-in replacement for Microsoft's tools.
If you use SmarterMail, it's important that you immediately ensure that you've updated your install to the latest version, thanks to an exploitable vulnerability found near the end of 2025.
From Broadcom: "CVE-2025-52691 is a recently disclosed critical (CVSS score 10.0) arbitrary file upload vulnerability affecting SmarterTools SmarterMail software[.] If successfully exploited the flaw might allow attackers to upload arbitrary files to any location on the vulnerable mail server, potentially leading up to a remote code execution. The vulnerability has been already patched in product build version 9413 and later."
An exploitable server already configured for email is an attractive target for bad actors looking for ways to spread phishing, spam and malware. Control of your server means they could easily send emails as you, and fully pass authentication checks, so that's one of many good reasons that you should ensure that you keep your email infrastructure up to date and protected.
SmarterMail is an email/collaboration suite of tools positioned as a Microsoft Exchange alternative, offering native MAPI support, supposedly making it easy as a drop-in replacement for Microsoft's tools.
If you use SmarterMail, it's important that you immediately ensure that you've updated your install to the latest version, thanks to an exploitable vulnerability found near the end of 2025.
From Broadcom: "CVE-2025-52691 is a recently disclosed critical (CVSS score 10.0) arbitrary file upload vulnerability affecting SmarterTools SmarterMail software[.] If successfully exploited the flaw might allow attackers to upload arbitrary files to any location on the vulnerable mail server, potentially leading up to a remote code execution. The vulnerability has been already patched in product build version 9413 and later."
An exploitable server already configured for email is an attractive target for bad actors looking for ways to spread phishing, spam and malware. Control of your server means they could easily send emails as you, and fully pass authentication checks, so that's one of many good reasons that you should ensure that you keep your email infrastructure up to date and protected.
Read more about this here from The Hacker News.
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