Metadata Modification Vulnerability in SEPPmail Gateway Enables Bypass

Publication date: 2026-04-02

Last updated on: 2026-04-16

Assigner: Switzerland Government Common Vulnerability Program

Description

SEPPmail Secure Email Gateway before version 15.0.3 allows an external user to modify GINA webdomain metadata and bypass per-domain restrictions.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-02

Last Modified

2026-04-16

Generated

2026-07-06

AI Q&A

2026-04-02

EPSS Evaluated

2026-07-05

NVD

CVE-2026-29134

EUVD

EUVD-2026-18148

Affected Vendors & Products

Vendor	Product	Version / Range
seppmail	secure_email_gateway	to 15.0.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-807	The product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism.

Attack-Flow Graph

Executive Summary

This vulnerability affects SEPPmail Secure Email Gateway versions before 15.0.3. It allows an external user to modify the GINA webdomain metadata, which in turn enables them to bypass restrictions that are set on a per-domain basis.

Impact Analysis

By exploiting this vulnerability, an external attacker could alter domain-specific metadata and bypass domain restrictions. This could potentially allow unauthorized access or actions that are normally restricted by domain policies, leading to security breaches or misuse of the email gateway.

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