What is the CVSS score of CVE-2026-2747?

CVE-2026-2747 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-2747?

Within 24 hours: Identify all SEPPmail deployments and confirm version numbers; notify business stakeholders of potential exposure risk. Within 7 days: Implement network segmentation to restrict gateway access, disable inline PGP decryption if operationally feasible, and monitor email logs for suspicious access patterns. Within 30 days: Establish patch management timeline with vendor, test version 15.0.1 or later in staging environment, and prepare deployment schedule for production systems.

Seppmail CVE-2026-2747

HIGH

Information Exposure (CWE-200)

2026-03-04 vulnerability@ncsc.ch

Information Disclosure Seppmail

7.5

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send email with inline PGP message
Exploit

SEPPmail decrypts without isolation
Impact

Expose plaintext sensitive data to unauthorized recipient

Vulnerability Assessment

Weakness	CWE CWE-200 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V14 - Data Protection Data exposure prevention MITRE ATT&CK 2 techniques across 2 tactics: Collection, Discovery The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	SEPPmail Secure Email Gateway versions before 15.0.1 with inline PGP message processing enabled. No special conditions — remote unauthenticated exploitation against default configurations of affected SEPPmail versions.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required.
Exploit ScenarioDerived	An attacker without authentication could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

SEPPmail Secure Email Gateway versions prior to 15.0.1 fail to properly isolate decrypted PGP message content from surrounding plaintext, enabling attackers to access encrypted sensitive information over the network without authentication. This high-severity flaw affects organizations relying on SEPPmail for secure email handling and exposes confidential data despite encryption protections. No patch is currently available for this vulnerability.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:05 CVSS 7.5

SEPPmail Secure Email Gateway before version 15.0.1 decrypts inline PGP messages without isolating them from surrounding unencrypted content, allowing exposure of sensitive information to an unauthorized actor. [CVSS 7.5 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-200 (Information Exposure). Affects Seppmail. SEPPmail Secure Email Gateway before version 15.0.1 decrypts inline PGP messages without isolating them from surrounding unencrypted content, allowing exposure of sensitive information to an unauthorized actor.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionCVE.org

Executive ViewAI

Why It Matters

SEPPmail Secure Email Gateway instances before version 15.0.1 fail to properly isolate decrypted PGP messages, potentially exposing sensitive information to unauthorized actors. Organizations relying on this gateway for email encryption protection should assess their deployment status immediately and implement interim controls while awaiting a vendor patch.

Business Impact: High

Compensating Controls

Disable inline PGP decryption feature if business operations permit; implement strict network access controls and segmentation around the gateway; enable comprehensive email logging and DLP (Data Loss Prevention) rules to detect exfiltration attempts; route encrypted messages to alternative secure processing channels; conduct increased email security monitoring and user awareness training on encrypted message handling.

Threat Intelligence Overview

EPSS Score

0.0%

Top 87% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.