Key insight: When a video shows objects flashing at seemingly random positions, composite all frames together. The positions themselves encode the hidden data — each frame contributes one pixel/cell ...
See also: server-side-advanced.md for Part 1 (ExifTool, Go rune/byte mismatch, zip symlink traversal, path traversal bypasses, Flask/Werkzeug debug, XXE external DTD, WeasyPrint SSRF, MongoDB regex ...
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