CVE-2026-29134Network attack vector

Domain restriction bypass via mutable GINA metadata

Published Apr 2, 2026 · Updated Apr 2, 2026

Authorization bypass in SEPPmail Secure Email Gateway before 15.0.3 allows remote authenticated users to evade GINA domain restrictions. The GINA web interface accepts an external user's changes to webdomain metadata and then relies on that untrusted metadata when enforcing per-domain access controls. Access to an external GINA account is required; the bypass permits cross-domain metadata changes and associated access, without reported service interruption.

CVSS severity5.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in SEPPmail Secure Email Gateway before 15.0.3 allows remote authenticated users to evade GINA domain restrictions. The GINA web interface accepts an external user's changes to webdomain metadata and then relies on that untrusted metadata when enforcing per-domain access controls. Access to an external GINA account is required; the bypass permits cross-domain metadata changes and associated access, without reported service interruption.

The record

CVE
CVE-2026-29134
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
SEPPmail
Product
Secure Email Gateway
Classifications
CWE-807, CAPEC-1, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <15.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SEPPmail · Secure Email Gatewayversion=0 <15.0.3

Published CVSS scores

7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.3Switzerland Government Common Vulnerability ProgramCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-807Reliance on Untrusted Inputs in a Security Decision
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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