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CVE-2026-29133

Seppmail Secure Email Gateway vulnerability

9.1 CRITICALEPSS 0.40%
  1. Published2 Apr 2026

Description

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to upload PGP keys with UIDs that do not match their email address.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Seppmail Secure Email Gateway< 15.0.3

Remediation

Fixed in
Seppmail Secure Email Gateway≥ 15.0.3

References

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Frequently asked

Is CVE-2026-29133 being actively exploited?

CVE-2026-29133 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.40%.

How severe is CVE-2026-29133?

CVE-2026-29133 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-29133?

Affected products include Seppmail Secure Email Gateway.

How do I fix CVE-2026-29133?

Upgrade affected software to a fixed version, for example Seppmail Secure Email Gateway 15.0.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-29133 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.