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CVE-2026-23760: SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability

criticalknown exploitedpublic exploitCVE-2026-23760
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: SmarterToolsproduct: SmarterMailAuthentication bypass
What
An authentication bypass vulnerability in the password reset API could allow unauthenticated attackers to reset administrator accounts.
Who is affected
Deployments of SmarterMail are affected.
Urgency
Remediation is urgent as the vulnerability is actively exploited and critical in severity.
Action
Apply the latest security updates from SmarterTools.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-01-26
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-23760

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-23760coverage & exploitation statusNVD · CVE.org

Recent advisories for SmarterTools SmarterMail Authentication

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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