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Threats / SmarterTools / CVE-2026-23760
CVE-2026-23760 · EUVD no mirror located · GCVE no mirror located Verified 2026-06-07

SmarterTools SmarterMail vulnerability

SmarterMail password reset API allows unauthenticated attackers to reset administrator accounts without verification, enabling full administrative compromise.

Verdict

Today item, not a backlog item.

An unauthenticated attacker can bypass authentication by directly calling the force-reset-password endpoint with a target administrator username and new password, gaining complete control of the SmarterMail instance without requiring existing credentials or a valid reset token.

CISA KEV Yes · 2026-01-263Ransomware use Flagged3EPSS 0.81651 (verify live)4
01

Is it exploitable?

— the evidence, ranked above the score
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-26), flagged for known ransomware use.
CISA KEV ↗Confirmed
Probability (EPSS)
EPSS 0.81651 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
FIRST EPSS ↗High
Severity / affected
Affected: SmarterTools, SmarterMail. Confirm exact fixed builds in the vendor advisory.
NVD ↗Reported
Weakness (CWE)
Mapped to CWE-288 Auth Bypass via Alternate Path — weakness family: Authentication.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
NVD ↗Reported
WeaknessCWE-288 · Auth Bypass via Alternate PathAuthentication
02

Who’s exploiting it?

— attribution turns risk into urgency
Attribution not established

No threat-actor attribution is established from the public feed for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.

03

Why it matters

— the attack path, told twice: adversary, then board
1

Front door — unauthenticated access narrative 1

Attacker
I identify the force-reset-password endpoint and craft an anonymous request targeting a system administrator account with a new password of my choosing.
Business
Administrative access is compromised without detection or credential compromise, exposing all user data, email content, and system configuration to the attacker.
2

Keys to the kingdom — privilege/identity takeover narrative 2

Attacker
I reset the primary administrator account and establish persistent access to the mail server infrastructure.
Business
The organization loses control of its email system and cannot audit or revoke my access, enabling data exfiltration and service disruption.
3

Lateral reach — past segmentation narrative 3

Attacker
I use administrative privileges to deploy ransomware, encrypt mailboxes, and demand payment for recovery.
Business
Email services become unavailable, business communications halt, and the organization faces financial extortion and potential regulatory penalties for data loss.
04

What to do

— defensible action
  • Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05

Coverage & confidence

— what we know, and what we don’t

Established (cited)

  • KEV listing (CISA)
  • Ransomware-use flag (CISA)
  • EPSS probability (FIRST)
  • CWE weakness mapping (NVD)
  • Catalogued by VulnCheck (CNA)
  • Named finder/reporter credit (CVE.org)

    • Coverage gaps — stated, not hidden

  • No EUVD / GCVE mirror in feed — single-authority dependency for the identifier.
  • EPSS & exposure are time-varying; verify live at the source.
  • Threat-actor attribution not established from feed data — absence of a name is not absence of compromise.
    • Disclosure & credit2
    Catalogued by VulnCheckCNA
    Credited with finding itPiotr Bazydlo & Sina Kheirkhah of watchTowrfinderMarkus Wulftange of CODE WHITE GmbHfinder