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Merged
pull merged 2 commits into from
Mar 16, 2026
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[pull] master from swisskyrepo:master #390

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8847706
XXE zip recompression tips
noraj Mar 16, 2026
f695b0a
Merge pull request #824 from noraj/patch-2
swisskyrepo Mar 16, 2026
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2 changes: 1 addition & 1 deletion XXE Injection/README.md
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Expand Up @@ -591,7 +591,7 @@ cd XXE
zip -r -u ../xxe.xlsx *
```

Warning: Use `zip -u` (<https://infozip.sourceforge.net/Zip.html>) and not `7z u` / `7za u` (<https://p7zip.sourceforge.net/>) or `7zz` (<https://www.7-zip.org/>) because they won't recompress it the same way and many Excel parsing libraries will fail to recognize it as a valid Excel file. A valid magic byte signature with (`file XXE.xlsx`) will be shown as `Microsoft Excel 2007+` (with `zip -u`) and an invalid one will be shown as `Microsoft OOXML`.
Warning: Use `zip -u` (<https://infozip.sourceforge.net/Zip.html>) and not `7z u` / `7za u` (<https://p7zip.sourceforge.net/>) or `7zz` (<https://www.7-zip.org/>) because they won't recompress it the same way and many Excel parsing libraries will fail to recognize it as a valid Excel file. A valid magic byte signature with (`file XXE.xlsx`) will be shown as `Microsoft Excel 2007+` (with `zip -u`) and an invalid one will be shown as `Microsoft OOXML`. Alternatively, with 7z you can specify the correct compression algorithm with: `7z a -tzip` to get the correct signature.

Add your blind XXE payload inside `xl/workbook.xml`.

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