CVE-2026-107567: hMailServer 6.0.0 through 6.3.6

CVE-2026-107567. CVSS 3.1 base score 7.5 (HIGH, Vendor/CNA).

Affected technology

hMailServer · 6.0.0 through 6.3.6
Progressive Robot Ltd

Description’s affected range: through 6.3.6

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

A remote unauthenticated attacker can have mail they write signed with the DKIM key of a domain the server hosts, so that it passes DKIM and DMARC for that domain at other receivers. Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and availability impact as none; integrity impact as high.

Published 19-Oct-2026 17:58 UTC

CWE: CWE-348
CCR priority: 30.0 /100 (P4)
CVSS 3.1: 7.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N · Vendor/CNA
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-19 17:57:47.606446+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-107567.html