MISP CTI-Transmute up to 1.4.0 PDF Generation server-side request forgery

Summaryinfo

A vulnerability classified as problematic has been found in MISP CTI-Transmute up to 1.4.0. This impacts an unknown function of the component PDF Generation. The manipulation leads to server-side request forgery. This vulnerability is traded as CVE-2026-69078. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in MISP CTI-Transmute up to 1.4.0. It has been rated as problematic. This issue affects some unknown processing of the component PDF Generation. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality. The summary by CVE is:

CTI-Transmute is affected by a server-side request forgery vulnerability in the evaluation report PDF-generation functionality. User-controlled CTI content, including conversion names, descriptions, and comments, is converted from Markdown to HTML and rendered as a PDF using WeasyPrint. Before the patch, the renderer used WeasyPrint’s default URL-fetching behavior without restricting the protocols or destinations that could be referenced by the generated HTML. An attacker able to supply content included in an evaluation report could inject crafted resource references using schemes such as http://, https://, or file://. When the report was rendered, CTI-Transmute could fetch these resources using the application server’s network connectivity and filesystem privileges. Successful exploitation could allow an attacker to: * access services available only from the CTI-Transmute server or its internal network; * probe internal hosts and service endpoints; * retrieve local files readable by the application process; and * expose fetched content through the generated PDF, depending on the referenced resource type and rendering context. The vulnerability is corrected by providing WeasyPrint with a restrictive URL fetcher that permits only self-contained data: URIs. The externally hosted Google Fonts stylesheet was also removed so that PDF generation performs no intentional network or filesystem fetches.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-69078 since 08/03/2026. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available.

Applying the patch 20f35307bcb706c8dd8ca3884a88fb36b05b5244 is able to eliminate this problem.

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Productinfo

Vendor

• MISP

Name

• CTI-Transmute

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4.0

License

• open-source

Website

• Product: https://github.com/MISP/cti-transmute/

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