PT-2026-29704 · Seppmail · Seppmail Secure Email Gateway

Andris Suter-Dörig + 2 · Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-29141

Positive Technologies (AI Summary)

CVSS v4.0

7.7

High

Base vector

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

Name of the Vulnerable Software and Affected Versions SEPPmail Secure Email Gateway versions prior to 15.0.3

Description SEPPmail Secure Email Gateway versions prior to 15.0.3 are susceptible to a bypass of subject sanitization. This allows an attacker to forge tags, such as '[signed OK]', within the email subject.

Recommendations Update SEPPmail Secure Email Gateway to version 15.0.3 or later.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-29141

Affected Products

Seppmail Secure Email Gateway

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-29141 · Security Note
• https://twitter.com/CVEnew/status/2039647695833575870 · Twitter Post
• https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503 · Note