PT-2026-29700 · Seppmail · Seppmail Secure Email Gateway

Andris Suter-Dörig + 2 · Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-29136

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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

Description The SEPPmail Secure Email Gateway is susceptible to HTML injection in notifications regarding new CA certificates. An attacker can inject HTML code into these notifications.

Recommendations Update to version 15.0.3 or later.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-29136

Affected Products

Seppmail Secure Email Gateway

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-29136 · Security Note
• https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503 · Note
• https://twitter.com/CVEnew/status/2039647685373022421 · Twitter Post