CVE-2026-75418

Deferred Deferred - Pending Action

Path Traversal in Lektor Windows Preview Server

Publication date: 2026-08-28

Last updated on: 2026-09-01

Assigner: MITRE

Description

A path traversal vulnerability exists in the built-in preview/development web server of Lektor <3.3.14 on Windows. An attacker with network access to the server can send a crafted HTTP request containing path traversal sequences to read arbitrary files accessible to the process, disclosing sensitive information such as system files and deployment configuration files containing credentials.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-09-01

Generated

2026-09-17

AI Q&A

2026-08-28

EPSS Evaluated

2026-09-15

NVD

CVE-2026-75418

EUVD

EUVD-2026-67322

Affected Vendors & Products

Vendor	Product	Version / Range
lektor	lektor	to 3.3.14 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

Executive Summary

This vulnerability is a path traversal issue in Lektor's built-in preview/development web server on Windows versions before 3.3.14. An attacker can send a specially crafted HTTP request with path traversal sequences to read files outside the intended directory. This could expose sensitive files like system files or configuration files containing credentials.

Detection Guidance

To detect this vulnerability, monitor network traffic for HTTP requests containing path traversal sequences like ../ or ..%5c targeting the Lektor server. Check server logs for unusual file access patterns or requests to sensitive paths such as /etc/passwd or Windows system files.

Impact Analysis

If you run a vulnerable Lektor server on Windows, an attacker could access sensitive files on your system. This might include configuration files with credentials, internal system files, or other confidential data. The impact is higher if the server runs with elevated privileges.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating regulations like GDPR (data protection) or HIPAA (health information privacy). Exposure of credentials or personal data may result in compliance breaches, legal penalties, or reputational damage.

Mitigation Strategies

Immediately upgrade Lektor to version 3.3.14 or later. If upgrading is not possible, restrict network access to the server via firewall rules or disable the built-in preview/development web server if unused. Review file permissions to ensure sensitive files are not accessible to the server process.

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