[d0linger]

🚨 Severity: MEDIUM
💡 Vulnerability: Missing input list length and string length validation on r.PostForm["columns"] in handleAccountingProfileSave.
🎯 Impact: Oversized POST payload submissions could cause CPU and memory resource exhaustion (DoS) during form parsing, string joining, and column splitting operations on the administrative accounting profile configuration route /rechnungsjournal/profile.
🔧 Fix: Capped len(r.PostForm["columns"]) against maxFormListLen before strings.Join and validated joined columns against maxNoteLen via s.tooLong in internal/server/journal.go.
✅ Verification: Added unit tests in internal/server/input_limits_test.go and integration tests in internal/server/journal_integration_test.go. Verified with go test ./....

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PR created automatically by Jules for task 16952842325120142018 started by @d0linger

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