CRITICAL

CVE-2026-100741

CVSS v3

9.8

CRITICAL

EPSS Score

1.7 %

exploit probability, as of 2026-09-27

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

Eval injection in the JScript event-script dispatcher in Progressive Robot Ltd's hMailServer, versions 6.0.0 through 6.3.3 on Windows, allows a remote, unauthenticated attacker to run arbitrary JScript inside the hMailServer service process, with the privileges of the service account, via a password containing a backslash followed by an apostrophe, sent in any logon (SMTP AUTH, POP3, IMAP) that names an existing, active account. Exploitation requires a non-default configuration: event scripting

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-09-27
Last Modified: 2026-09-27

Frequently asked questions

What is CVE-2026-100741?

Is CVE-2026-100741 actively exploited?

Active exploitation of CVE-2026-100741 has not been confirmed. Its EPSS score was 1.7% on 2026-09-27, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-100741?

CVE-2026-100741 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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