CVE-2026-23760Known exploitationPublic exploitNetwork attack vectorHinoki check available

Unauthenticated administrator takeover via unchecked password reset

Published Jan 22, 2026 · Updated Jan 22, 2026

Authentication bypass in SmarterTools SmarterMail before 100.0.9511 allows remote attackers to reset a system administrator password. The anonymous force-reset-password endpoint trusts IsSysAdmin and writes NewPassword without authenticating the caller or validating OldPassword. Knowledge or guessing of an administrator username is the only gate, after which the reset credential grants full application administration and command execution as SYSTEM or root.

CVSS severity9.3
Critical
EPSS probability96.44%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in SmarterTools SmarterMail before 100.0.9511 allows remote attackers to reset a system administrator password. The anonymous force-reset-password endpoint trusts IsSysAdmin and writes NewPassword without authenticating the caller or validating OldPassword. Knowledge or guessing of an administrator username is the only gate, after which the reset credential grants full application administration and command execution as SYSTEM or root.

The record

CVE
CVE-2026-23760
Published
Jan 22, 2026
Updated
Jan 22, 2026
Vendor
SmarterTools Inc.
Product
SmarterMail
Classifications
CWE-288, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 22, 2026Record updatedLatest update available in the CVE record.
  3. Jan 26, 2026Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <100.0.9511

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SmarterTools Inc. · SmarterMailversion=0 <100.0.9511

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 16, 2026. Gaps indicate unavailable data.
Sep 10, 2026Sep 16, 2026
View daily counts
Reporting dayUnique IPs
Sep 10, 2026Unavailable
Sep 11, 20261
Sep 12, 2026Unavailable
Sep 13, 2026Unavailable
Sep 14, 2026Unavailable
Sep 15, 20261
Sep 16, 2026Unavailable
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1098Account Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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