Why is '[0] so commonly (and recently) appended to query strings?

Asked Dec 29 '21 at 23:02

Active Dec 30 '21 at 11:17

Viewed 32 times

I use a WAF that monitors suspicious query string and form POST values. Over the last several months I've noticed a dramatic uptick in query strings that have this sequence of 4 characters appended to the usual (i.e. 'normal') values:

'[0]

Why is this so common? I know why stuff like SQL injection attempts and JS snippets appear all the time, but is this string a known attack vector?

edited Dec 30 '21 at 11:17

asked Dec 29 '21 at 23:02

CodeWhisperer

Please [edit] your question to include the URLs which has been logged, that include this `[0]` sequence. – Progman Dec 29 '21 at 23:55
I’m voting to close this question because it is really a web server question, for [webmasters.se]. – Raymond Chen Dec 30 '21 at 00:17

Why is '[0] so commonly (and recently) appended to query strings?

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