Threat Intelligence / CVE / CVE-2026-23760

CVE-2026-23760 — Smartertools Smartermail

CISA KEVRansomware
CVSS v3.1 9.8 (CRITICAL) · CVSS v4.0 9.3 · EPSS 78.7% (higher than 99.0% of all scored CVEs) · Priority 10/10 · Published 2026-01-22

As of 2026-01-27, CVE-2026-23760 is a CRITICAL-severity vulnerability in Smartertools Smartermail, CVSS v3.1 9.8, EPSS 78.7% (99.0th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-26), with a US federal remediation deadline of 2026-02-16, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-23760, most recently “Storm-1175 Medusa Ransomware Zero-Day Exploitation Campaign (CVE-2026-23760, CVE-2025-10035)”.

Last updated: 2026-01-27

What is 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 reset token when resetting system administrator accounts. An unauthenticated attacker can supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance. NOTE: SmarterMail system administrator privileges grant the ability to execute operating system commands via built-in management functionality, effectively providing administrative (SYSTEM or root) access on the underlying host.

The record classifies CVE-2026-23760 under weakness class CWE-288. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 234 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 base score
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (FIRST)
78.7% probability of exploitation in the next 30 days, higher than 99.0% of all scored CVEs
CISA KEV
Listed since 2026-01-26, federal remediation deadline 2026-02-16 — used in known ransomware campaigns
Threadlinqs priority
10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
Published
2026-01-22, last modified 2026-01-27

Is CVE-2026-23760 being exploited?

CISA added CVE-2026-23760 to the Known Exploited Vulnerabilities catalog on 2026-01-26, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-02-16 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-23760

Because CVE-2026-23760 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-02-16. No vendor patch reference has been recorded for CVE-2026-23760 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-23760

2 tracked threats in the Threadlinqs corpus reference CVE-2026-23760, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-23760 are available via the Threadlinqs MCP server (Purple tier). View plans →

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