PT-2026-29699 · Seppmail · Seppmail Secure Email Gateway

Andris Suter-Dörig + 2 · Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-29131

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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 condition that allows attackers to read the contents of emails encrypted for other users by using a specially crafted email address.

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

Fix

Weakness Enumeration

CWE-90

Related Identifiers

CVE-2026-29131

Affected Products

Seppmail Secure Email Gateway

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-29131 · Security Note
• https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503 · Note
• https://twitter.com/CVEnew/status/2039647692125847786 · Twitter Post