CVE-2026-104286
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Path Traversal in Fortinet FortiMail

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: Fortinet, Inc.

Description
An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2.0 through 7.2.9 may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.

CVSS Scores

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-02
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-104286
EUVD
EUVD-2026-91042

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
fortinet fortimail From 8.0.0 (inc) to 8.0.1 (inc)
fortinet fortimail From 7.6.0 (inc) to 7.6.6 (inc)
fortinet fortimail From 7.4.0 (inc) to 7.4.8 (inc)
fortinet fortimail From 7.2.0 (inc) to 7.2.9 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

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Executive Summary

This is a path traversal vulnerability in Fortinet FortiMail versions 7.2.0 through 8.0.1. It allows an unauthenticated attacker to write arbitrary files on the system by sending specially crafted HTTP or HTTPS requests. This occurs because the software does not properly restrict file paths in these requests.

Detection Guidance

This vulnerability involves path traversal in Fortinet FortiMail versions 8.0.0-8.0.1, 7.6.0-7.6.6, 7.4.0-7.4.8, and 7.2.0-7.2.9. Detection requires checking for unauthorized file writes via crafted HTTP/HTTPS requests. Monitor system logs for suspicious file operations or unexpected file creations in restricted directories. Use network traffic analysis tools like Wireshark to inspect HTTP requests for path traversal patterns (e.g., '../' sequences). Ensure FortiMail is updated to the latest patched version.

Impact Analysis

An attacker could exploit this to write malicious files on your FortiMail system. This could lead to remote code execution, system compromise, data theft, or disruption of email services. The high CVSS score (9.8) indicates severe impact with no authentication required.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's integrity and confidentiality requirements or HIPAA's security rules. Organizations using affected FortiMail versions may face compliance violations, fines, or legal consequences if exploited.

Mitigation Strategies

Update FortiMail to a patched version that addresses the path traversal vulnerability. Fortinet has released fixes for affected versions 7.2.0-7.2.9, 7.4.0-7.4.8, 7.6.0-7.6.6, and 8.0.0-8.0.1. Apply the latest security patches immediately.

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