PT-2026-22890 · Seppmail · Seppmail Secure Email Gateway

Andris Suter-Dörig + 2 · CVE-2026-27444 · Published 2026-03-04 · Updated 2026-03-05

Positive Technologies (AI Summary)

CVSS v4.0

7.8

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N

Name of the Vulnerable Software and Affected Versions SEPPmail Secure Email Gateway versions prior to 15.0.1

Description SEPPmail Secure Email Gateway versions prior to 15.0.1 have an issue where the software incorrectly interprets email addresses within email headers. This misinterpretation can lead to conflicts with other mail infrastructure, potentially allowing an attacker to forge the email source or decrypt the email content.

Recommendations Update SEPPmail Secure Email Gateway to version 15.0.1 or later.

Fix

Weakness Enumeration

CWE-436

Related Identifiers

CVE-2026-27444

Affected Products

Seppmail Secure Email Gateway

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-27444 · Security Note
• https://osv.dev/vulnerability/CVE-2026-27444 · Vendor Advisory
• https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure · Vendor Advisory
• https://t.me/cveNotify/154348 · Telegram Post
• https://twitter.com/CVEnew/status/2029125971576533299 · Twitter Post
• https://t.me/CVEtracker/46297 · Telegram Post
• https://twitter.com/infoflowcloud/status/2029127468867523066 · Twitter Post