It is being reported that a critical authentication bypass vulnerability in SmarterTools SmarterMail is actively being exploited in the wild by attackers.
We did not plan to publish this blog post today – Wednesdays are meme days – but that changed when an anonymous reader reached out to us with a tip – somebody is currently exploiting SmarterMail and resetting admin passwords.
This same reader was kind enough to point us to a seemingly related SmarterMail forum thread, where a user is claiming that they cannot access their admin account anymore and provided log file excerpts of potentially related and suspicious behaviour
Commenting on this news is Martin Jartelius, AI Product Director at Outpost24:
“This incident highlights a growing reality in cybersecurity: the real risk often starts after a patch is released. Zero-day vulnerabilities are difficult to defend against, but once a fix becomes public, attackers quickly reverse-engineer it to understand and weaponize the flaw. What used to take weeks now takes days, or even hours, especially with logic-based vulnerabilities like this one, where exploitation requires little sophistication. The defender’s only advantage is speed. Organizations need immediate visibility into what software is running in their environment and the ability to map new vulnerability intelligence against it in real time. When attackers can move from patch to exploit in hours, rapid awareness and response are critical.”
This illustrates how crafty the bad guys can be. Which means you need to be on top of patching all the things so that attackers don’t have an advantage over you.
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This entry was posted on January 23, 2026 at 3:27 pm and is filed under Commentary with tags Hacked. You can follow any responses to this entry through the RSS 2.0 feed.
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Attackers Reverse‑Engineer Patch to Exploit SmarterMail Admin Bypass in the Wild
It is being reported that a critical authentication bypass vulnerability in SmarterTools SmarterMail is actively being exploited in the wild by attackers.
We did not plan to publish this blog post today – Wednesdays are meme days – but that changed when an anonymous reader reached out to us with a tip – somebody is currently exploiting SmarterMail and resetting admin passwords.
This same reader was kind enough to point us to a seemingly related SmarterMail forum thread, where a user is claiming that they cannot access their admin account anymore and provided log file excerpts of potentially related and suspicious behaviour
Commenting on this news is Martin Jartelius, AI Product Director at Outpost24:
“This incident highlights a growing reality in cybersecurity: the real risk often starts after a patch is released. Zero-day vulnerabilities are difficult to defend against, but once a fix becomes public, attackers quickly reverse-engineer it to understand and weaponize the flaw. What used to take weeks now takes days, or even hours, especially with logic-based vulnerabilities like this one, where exploitation requires little sophistication. The defender’s only advantage is speed. Organizations need immediate visibility into what software is running in their environment and the ability to map new vulnerability intelligence against it in real time. When attackers can move from patch to exploit in hours, rapid awareness and response are critical.”
This illustrates how crafty the bad guys can be. Which means you need to be on top of patching all the things so that attackers don’t have an advantage over you.
Share this:
Like this:
Related
This entry was posted on January 23, 2026 at 3:27 pm and is filed under Commentary with tags Hacked. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.