- dispo workbook imports are pinned to DISPO_IMPORT_DIR (default ./imports):
tRPC input rejects absolute paths and .. segments, runtime reader
re-validates containment via path.relative. Closes a path-traversal
class that reached ExcelJS CVEs through admin/compromised tokens.
- image validator now checks the full 8-byte PNG magic, enforces PNG IEND
and JPEG EOI trailers, scans the decoded buffer for markup polyglot
markers (<script, <svg, <iframe, javascript:, onerror=, ...), and
explicitly rejects SVG. Provider-generated covers (DALL-E, Gemini) run
through the same validator before persistence — an untrusted upstream
cannot smuggle a stored-XSS payload past us.
- added image-validation.test.ts and tightened documentation.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Hartmut