I think the default is to apply equal weight to each term in the box (not really an "AND", but not really an "OR", either).
This document explains it in more detail:
Thank for your Answer.
I don't find in this documentation anything for searching two or more terms without Operator respectively without quotation marks.
The result of a search inculde results with only the first term and results of only the second term. That's in my Opinion an OR query.
EDIT: @ Matthew
Sorry, you are right. As a first all results are displayed with two terms.
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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