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EUVD-2026-368249

2026-10-04T05:07:40.936585+00:00

EUVD-2026-368249

fkie_cve-2026-49865

2026-10-04T05:07:40.936623+00:00

Kimai is an open-source time tracking application. Versions prior to 2.58.0 contain a server-side request forgery vulnerability in their invoice PDF preview and generation workflow. If an attacker can control Markdown content that is later rendered into an invoice PDF, such as `Customer.invoiceText`, the server-side PDF renderer will fetch remote image URLs embedded in Markdown image syntax. This allows the application server to issue outbound requests to attacker-controlled or internal targets during PDF rendering. The behavior can be used for internal network probing, server-side reachability checks, and potentially follow-on exploitation depending on deployment environment and accessible internal services. Version 2.58.0 patches the issue.

GHSA-pj8j-p4g4-4vw8 — Kimai has Server-Side Request Forgery in Invoice PDF Rendering via Markdown Image URLs

2026-10-04T05:07:40.936661+00:00

Affected: Packagist: kimai/kimai

### Summary

Kimai 2.56.0 contains a server-side request forgery vulnerability in its invoice PDF preview and generation workflow. If an attacker can control Markdown content that is later rendered into an invoice PDF, such as `Customer.invoiceText`, the server-side PDF renderer will fetch remote image URLs embedded in Markdown image syntax.

This allows the application server to issue outbound requests to attacker-controlled or internal targets during PDF rendering. The behavior can be used for internal network probing, server-side reachability checks, and potentially follow-on exploitation depending on deployment environment and accessible internal services.

### Details

The vulnerable behavior occurs in the invoice rendering chain when user-controlled Markdown is transformed into HTML and then rendered by mPDF.

- First, customer invoice text is copied into the invoice model. . Second, the default PDF invoice template renders that field through the Markdown-to-HTML filter. - Third, `md2html` enables full Markdown rendering. - Although safe mode is enabled, the tested Markdown image syntax still survives into the rendered HTML chain in a form that causes the PDF renderer to fetch the image resource. - Finally, the HTML is handed to mPDF.

The live test confirms that mPDF attempts to retrieve the remote image URL from the server side during PDF preview. This means the issue is not a template-injection problem but an SSRF condition caused by the rendering pipeline:

- at…