Directory Traversal in OpenCTI 3.3.1 Allows Arbitrary File Read

Publication date: 2026-01-30

Last updated on: 2026-02-13

Assigner: VulnCheck

Description

OpenCTI 3.3.1 is vulnerable to a directory traversal attack via the static/css endpoint. An unauthenticated attacker can read arbitrary files from the filesystem by sending crafted GET requests with path traversal sequences (e.g., '../') in the URL. For example, requesting /static/css//../../../../../../../../etc/passwd returns the contents of /etc/passwd. This vulnerability was discovered by Raif Berkay Dincel and confirmed on Linux Mint and Windows 10.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-30

Last Modified

2026-02-13

Generated

2026-07-06

AI Q&A

2026-01-31

EPSS Evaluated

2026-07-05

NVD

CVE-2020-37041

EUVD

EUVD-2020-30937

Affected Vendors & Products

Vendor	Product	Version / Range
citeum	opencti	3.3.1

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

OpenCTI 3.3.1 has a directory traversal vulnerability in its static/css endpoint. This means an unauthenticated attacker can send specially crafted GET requests containing path traversal sequences like '../' to access arbitrary files on the server's filesystem. For example, an attacker can retrieve sensitive files such as /etc/passwd by exploiting this flaw.

Impact Analysis

This vulnerability allows an attacker to read arbitrary files on the server without authentication, potentially exposing sensitive information such as system configuration files, user data, or credentials. This can lead to information disclosure and further exploitation of the affected system.

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