Peppol-py before 1.1.1 allows XXE attacks because of the Saxon configuration. When validating XML-based invoices, the XML parser could read files from the filesystem and expose their content to a remote host.
Exploitability
AV:NAC:LPR:LUI:NScope
S:CImpact
C:LI:NA:N5/CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:NInput Validation