8000 False positives with urlDecodeUni · Issue #4059 · coreruleset/coreruleset · GitHub
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False positives with urlDecodeUni #4059
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@theseion

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@theseion

Hi.
After updating the rules to version 4.12.0.
I got a lot of false positives. And selectively. from some browsers the same url worked without blocks. And other browsers had problems and triggered 949110
And when opening the root page of my resource.
after I returned htmlEntityDecode and removed urlDecodeUni in the rules.
921140
921150
921160
921151
The problem disappeared.
Where could be the bug and how to find it. Is it in urlDecodeUni or something in my resource code?

here is an example of a coded url for google ads
which some of them pass and some of them fail the rule.
%7C - |
%7B - {
%7D - }
utm_source=google&utm_medium=display&utm_campaign=kms%7C%7Bunix%7D%7Cgoogle%7Cazp&utm_content=729289294201&gad_source=5&gclid=EAIaIQob

Originally posted by @vagrantsd in #3824

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