What is CVE-2026-29144?

CVE-2026-29144 is a medium-severity vulnerability in Seppmail Secure Email Gateway, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2026-04-02.

How severe is CVE-2026-29144?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Improper input validation in Seppmail Secure Email Gateway

CVE-2026-29144

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge security tags using Unicode lookalike characters.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.002 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Seppmail Secure Email Gateway — versions 0
Seppmail Secure_email_gateway

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

vulnerability@ncsc.ch (release-notes, Release Notes)

Frequently asked questions

What is CVE-2026-29144?: CVE-2026-29144 is a medium-severity vulnerability in Seppmail Secure Email Gateway, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2026-04-02.
How severe is CVE-2026-29144?: Medium severity. CVSS v3 base score is 5.3 out of 10.