[d0linger]

Summary

• Severity: LOW
• Vulnerability: Unvalidated query parameter reflection (feedback) in invoice document view context.
• Impact: Arbitrary values passed to ?feedback=... on public or private invoice document URLs were stored in template page data without validation, allowing potential UI/status spoofing (displaying "Die Rückmeldung wurde gespeichert." when no feedback was submitted) or oversized query payload reflection.
• Fix: Restricted PortalFeedbackResult in renderInvoiceDocument (internal/server/invoice_document_page.go) to strictly allow only valid feedback status values ("confirmed" and "disputed").
• Verification: Added TestPortalFeedbackQueryValidation in internal/server/invoice_document_page_test.go and verified the full test suite passes with go test ./....

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PR created automatically by Jules for task 10656804699393229424 started by @d0linger

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[d0linger]

Superseded by #251

[google-labs-jules]

Superseded by #251

Acknowledged. Thanks for letting me know.