What is the CVSS score of CVE-2026-27442?

CVE-2026-27442 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: 0.1%.

How to fix or mitigate CVE-2026-27442?

Within 24 hours: Inventory all SEPPmail gateway deployments and identify versions below 15.0.1; document affected systems and notify security operations. Within 7 days: Implement network segmentation to restrict gateway access, enable verbose logging of attachment handling, and establish monitoring for suspicious file access patterns. Within 30 days: Upgrade to SEPPmail version 15.0.1 or later once released; if upgrade is not immediately feasible, evaluate alternative secure email solutions or implement WAF rules to filter suspicious attachment filenames.

Seppmail CVE-2026-27442

HIGH

Path Traversal (CWE-22)

2026-03-04 vulnerability@ncsc.ch

Path Traversal Seppmail

7.5

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Send GINA-encrypted email with crafted attachment filename
Exploit

Bypass filename validation in web interface
Impact

Access arbitrary files on gateway server

Vulnerability Assessment

Weakness	CWE CWE-22 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V5 - File Handling Path canonicalization, traversal prevention MITRE ATT&CK 2 techniques across 2 tactics: Discovery, Collection 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 GINA web interface enabled. No authentication required; default configurations allow remote exploitation via email attachment processing.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None.
Exploit ScenarioDerived	An attacker 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 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Improper filename validation in SEPPmail Secure Email Gateway's GINA web interface (versions before 15.0.1) enables unauthenticated remote attackers to access arbitrary files on the gateway through specially crafted encrypted email attachments. This path traversal vulnerability affects the confidentiality of sensitive data stored on affected systems. No patch is currently available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:05 CVSS 7.5

The GINA web interface in SEPPmail Secure Email Gateway before version 15.0.1 does not properly check attachment filenames in GINA-encrypted emails, allowing an attacker to access files on the gateway. [CVSS 7.5 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Validate and sanitize file path inputs. Use allowlists. 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-22 (Path Traversal). Affects Seppmail. The GINA web interface in SEPPmail Secure Email Gateway before version 15.0.1 does not properly check attachment filenames in GINA-encrypted emails, allowing an attacker to access files on the gateway.

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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

CVE-2026-27442 affects SEPPmail Secure Email Gateway versions prior to 15.0.1, allowing attackers to bypass attachment filename validation and access files on the gateway. Organizations using vulnerable versions face potential unauthorized file access and data exfiltration through encrypted email channels, with no patch currently available.

Business Impact: High

Compensating Controls

Implement network segmentation restricting gateway access to authorized systems only; enable attachment filename validation at gateway ingress points; disable GINA web interface if not operationally required; configure strict access controls on gateway file systems; deploy email content inspection and filtering rules to block suspicious attachment patterns; monitor gateway file access logs for anomalous activity; consider temporary disablement of encrypted email functionality until patch is available.

Threat Intelligence Overview

EPSS Score

0.1%

Top 84% 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 0.1%

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.