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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-44126

CRITICAL · 9.2 CVSS v4.0 Published 2026-05-08
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
SEPPmail Secure Email Gateway before version 15.0.4 insecurely deserializes untrusted data, which can be reached from the new GINA UI and may allow unauthenticated remote attackers to execute code via a crafted serialized object.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

SEPPmail Secure Email Gateway versions before 15.0.4 suffer from an insecure deserialization vulnerability where the application deserializes untrusted data without proper validation. This flaw is accessible through the new GINA web interface and allows unauthenticated remote attackers to send a crafted serialized object that leads to remote code execution.

MitigationUpgrade SEPPmail Secure Email Gateway to version 15.0.4 or later. If immediate patching is not feasible, consider restricting network access to the GINA UI or disabling it until the upgrade can be performed.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify SEPPmail Secure Email Gateway version
    Access the administration interface or check system information to determine the currently installed version of SEPPmail Secure Email Gateway
    Affected if The installed version is any version before 15.0.4
  2. Verify if GINA web interface is enabled
    Check the SEPPmail configuration to determine whether the GINA web interface feature is currently active and accessible
    Affected if The GINA web interface is enabled and reachable over the network
  3. Confirm network accessibility of GINA interface
    Attempt to access the GINA interface URL or check firewall/network configuration to determine if the interface is exposed to network requests
    Affected if The GINA interface is exposed and accepts external connections without additional authentication barriers

A user is affected if their SEPPmail Secure Email Gateway is running a version before 15.0.4 AND the GINA web interface is enabled and accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade SEPPmail Secure Email Gateway to version 15.0.4 or later. If immediate patching is not feasible, consider restricting network access to the GINA UI or disabling it until the upgrade can be performed.

Recommended fix Moderate confidence

SEPPmail Secure Email Gateway version 15.0.4

  1. 1. Identify the current installed version of SEPPmail Secure Email Gateway
  2. 2. If the current version is before 15.0.4, plan for upgrade to version 15.0.4
  3. 3. Obtain the upgrade package from the official SEPPmail download portal at downloads.seppmail.com
  4. 4. Review the upgrade documentation specific to your current version
  5. 5. Perform a backup of the current configuration and any custom settings
  6. 6. Execute the upgrade following the vendor's documented upgrade procedure
  7. 7. After upgrade, verify the GINA UI component is functioning correctly
  8. 8. Confirm the version has been updated to 15.0.4

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,920
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,072.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-44126 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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