GHSA-H5FH-7HWR-97MW Kimai has an arbitrary file read in its invoice PDF renderer (admin)

Summary Users with the role System-Admin ROLESYSTEADMIN and the permission uploadinvoicetemplate can upload PDF invoice templates, which can call pdfContext.setOption'associatedfiles', ... inside the sandboxed Twig render. This is forwarded to mPDF's SetAssociatedFiles, whose writer calls...