InvenTree up to 1.3.x Report Rendering write_pdf html server-side request forgery

Summaryinfo

A vulnerability has been found in InvenTree up to 1.3.x and classified as critical. Impacted is the function write_pdf of the component Report Rendering. The manipulation of the argument html leads to server-side request forgery. This vulnerability is referenced as CVE-2026-61749. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in InvenTree up to 1.3.x. This issue affects the function write_pdf of the component Report Rendering. The manipulation of the argument html 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, integrity, and availability. The summary by CVE is:

InvenTree is an Open Source Inventory Management System. Prior to 1.4.0, privileged staff users who can author report or label templates can cause WeasyPrint report rendering to retrieve attacker-selected resources through the HTTP and HTTPS URL schemes or the local file URI scheme. The HTML(string=html).write_pdf() path does not provide a restricted url_fetcher, and attach_to_model=True stores the original generated PDF before later processing, allowing fetched local files or internal HTTP response bodies to be recovered from embedded attachments. This enables full-read server-side request forgery, arbitrary local file disclosure including application credentials, and possible compromise of a superuser account. This issue is fixed in version 1.4.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-61749 since 07/10/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.4.0 eliminates this vulnerability.

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Productinfo

Name

• InvenTree

Version

• 1.0
• 1.1
• 1.2
• 1.3

Website

• Product: https://github.com/inventree/InvenTree/

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