Risk Letters

Exploited vulnerability

CVE-2026-23760

TLP:CLEAR

SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability

SmarterTools SmarterMail contains an authentication bypass using an alternate path or channel vulnerability in the password reset API. The force-reset-password endpoint permits anonymous requests and fails to verify the existing password or a reset token when resetting system administrator accounts. This could allow an unauthenticated attacker to supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance.

Facts

  • Vendor: SmarterTools
  • Product: SmarterMail
  • CVSS: 9.3
  • EPSS (probability of exploitation within 30 days): 96.4 %
  • On CISA's Known Exploited Vulnerabilities list since: 26 January 2026
  • First known exploitation: 26 January 2026
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 16 February 2026
  • Weakness: CWE-288
  • First seen by Risk Letters: 26 January 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD