What is CVE-2026-23760?

CVE-2026-23760 is a critical-severity vulnerability in Smartertools Smartermail, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 9.8/10. Published 2026-01-22.

How severe is CVE-2026-23760?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-23760 known to be exploited?

Yes. CVE-2026-23760 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-26), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.

Vulnerability in Smartertools Smartermail

CVE-2026-23760

SmarterTools SmarterMail versions prior to build 9511 contain an authentication bypass vulnerability in the password reset API. The force-reset-password endpoint permits anonymous requests and fails to verify the existing password or a res…

EPSS: 0.963 (99.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Smartertools Smartermail — versions 0

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-01-26. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-02-16.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

HORKimhab/CVE-2026-0001

References

disclosure@vulncheck.com (release-notes, Release Notes, patch)
disclosure@vulncheck.com (Exploit, technical-description, Third Party Advisory, exploit)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-23760?: CVE-2026-23760 is a critical-severity vulnerability in Smartertools Smartermail, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 9.8/10. Published 2026-01-22.
How severe is CVE-2026-23760?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-23760 known to be exploited?: Yes. CVE-2026-23760 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-26), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.