CVE Intelligence
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CVE-2026-44126: SEPPmail Secure Email Gateway - Insecure Deserialization

CVE-2026-44126 affects SEPPmail Secure Email Gateway before version 15.0.4 and is classified as insecure deserialization of untrusted data (CWE-502). According to the CNA, the flaw can be reached through the new GINA UI and may allow unauthenticated remote code execution, with a CVSS 4.0 base score of 9.2 (critical). No confirmed exploitation appears in the sources consulted, and the CVE is not listed in CISA KEV.

Published Oct 13, 2026 · Updated Oct 13, 2026 · Ler em português

Overview

CVE-2026-44126 is a critical insecure deserialization issue (CWE-502) in SEPPmail Secure Email Gateway versions before 15.0.4. The CNA description states that the weakness can be reached from the new GINA UI. The record was published on 2026-05-08 and is marked as Deferred in the source status.

Impact

  • The CNA description states that unauthenticated remote attackers may be able to execute code through a crafted serialized object.
  • The CVSS 4.0 vector supplied by the CNA indicates network attack vector, low attack complexity, no privileges and no user interaction required, with high impact on confidentiality, integrity and availability for the vulnerable system.
  • The vector also includes an attack requirements value of P (present), which means some preconditions may be needed for exploitation.
  • The record does not describe the consequences beyond the code execution scenario stated in the description.

Affected products and versions

  • Product: SEPPmail Secure Email Gateway.
  • Affected versions: versions before 15.0.4, as stated in the CNA description.
  • The record's affected product list is empty, so the exact list of affected builds and branches could not be confirmed from structured data.
  • The vendor release notes referenced in the record should be checked to confirm the fixed build and the security section.

Exploitation status

  • CISA KEV: not listed in the record.
  • No confirmed exploitation appears in the sources consulted for this analysis.
  • FIRST EPSS in the record: probability 0.00756 and percentile 0.53965, dated 2026-10-13. EPSS estimates the likelihood of exploitation activity and is not confirmation of exploitation.

Remediation and mitigation

  • Identify all SEPPmail Secure Email Gateway instances and their versions.
  • Plan an upgrade to version 15.0.4 or later, following the vendor release notes referenced in the record.
  • Until patched, restrict access to the GINA UI to trusted administrative networks and place the gateway behind network controls that limit exposure to the internet.
  • Confirm that backups and recovery procedures are current before applying the update.
  • After patching, verify the installed version through the vendor's administrative tools.

Detection guidance

  • Review web and application logs of the gateway for unexpected requests to the GINA interface, especially from unfamiliar sources or at unusual times.
  • Monitor the gateway for unexpected child processes, new files, or configuration changes.
  • Watch for unusual outbound connections originating from the gateway host.
  • Correlate gateway alerts with authentication and mail-flow logs to identify anomalous activity.

Limitations of the available information

  • The structured affected and fixes fields in the record are empty.
  • The record does not provide technical details of the vulnerable component beyond the CNA description.
  • The Infoguard Labs post listed in the references was not summarized here, and no claims are drawn from its contents.
  • No vendor-supplied CVSS data was found beyond the CNA entry in the record.
  • The EPSS date in the record is later than the publication date; the value is reported as recorded.

Frequently asked questions

What is CVE-2026-44126?

It is a critical insecure deserialization vulnerability (CWE-502) in SEPPmail Secure Email Gateway before version 15.0.4, according to the CNA description.

Is CVE-2026-44126 known to be actively exploited?

The record does not list it in CISA KEV, and no confirmed exploitation appears in the sources consulted for this analysis.

Which versions are affected?

The CNA description states versions before 15.0.4. The structured affected list in the record is empty, so the vendor release notes should be checked for details.

This analysis was drafted with AI assistance from verified source data and automatically checked against it.