Authentication Bypass in SmarterMail Product by SmarterTools
CVE-2026-23760

9.3CRITICAL

Key Information:

Vendor

Smartertools

Status
Smartermail
Vendor
CVE Published:
22 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-23760?

An authentication bypass vulnerability exists in SmarterMail's password reset API, enabling unauthenticated attackers to reset administrator passwords without proper verification. This flaw allows attackers to submit a new password along with a target administrator username, facilitating unauthorized administrative access. SmarterTools has issued patches to address this security issue, emphasizing the urgency for users to upgrade their installations to prevent potential exploitation.

Affected Version(s)

SmarterMail 0 < 100.0.9511

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-23760 - Proof of Concept

References

https://www.smartertools.com/smartermail/release-notes/cu...
release-notespatch
https://labs.watchtowr.com/attackers-with-decompilers-str...
technical-descriptionexploit
https://www.vulncheck.com/advisories/smartertools-smarter...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Piotr Bazydlo & Sina Kheirkhah of watchTowr
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