CVE-2026-2747Network attack vector

Decrypted PGP disclosure via mixed message content

Published Mar 4, 2026 · Updated Mar 4, 2026

Information disclosure in SEPPmail Secure Email Gateway before 15.0.1 allows remote attackers to read decrypted PGP content. The inline PGP handler decrypts ciphertext while preserving adjacent attacker-controlled cleartext in the same message instead of isolating the protected content. An unauthenticated remote attacker must submit a mixed-content email for gateway processing; the bounded result is disclosure of decrypted message data.

CVSS severity6.9
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in SEPPmail Secure Email Gateway before 15.0.1 allows remote attackers to read decrypted PGP content. The inline PGP handler decrypts ciphertext while preserving adjacent attacker-controlled cleartext in the same message instead of isolating the protected content. An unauthenticated remote attacker must submit a mixed-content email for gateway processing; the bounded result is disclosure of decrypted message data.

The record

CVE
CVE-2026-2747
Published
Mar 4, 2026
Updated
Mar 4, 2026
Vendor
SEPPmail
Product
Secure Email Gateway
Classifications
CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 4, 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 <15.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SEPPmail · Secure Email Gatewayversion=0 <15.0.1

Published CVSS scores

6.9Switzerland Government Common Vulnerability ProgramCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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