How usual/feasible is it for European universities to accept PhD candidates right after their bachelor's degree? (computer science field)
In contrast to Stephen McMahon's answer, which holds absolutely true for the UK, the situation in most of continental Europe is the opposite.
On the continent, it would be very unusual to start a PhD directly after one's BSc, hence the suggestion to look for &quot;precedent or a way for the Master's requirement to be bypassed&quot; at your Unis of interest. This is in direct contrast with the UK, where this is not even a requirement.
(Source: PhD from France, professional network from all over the EU, followed by a postdoc and a permanent position in the UK.)
As a side-note, PhD programmes in the UK often offer different levels of funding for home and international students (it used to be home+EU, but, alas, Brexit) -- or worded alternatively, some/most PhD programmes in the UK are only fully funded for British students. In my anecdotal experience, the international students that do apply to a very limited number of available fully-funded positions tend to be finishing an MSc while applying (or already hold one), despite it not being a requirement. And given a choice between an applicant with an MSc and an applicant with a BSc only, the one with an MSc typically has more to offer simply because they have had more time to demonstrate their skills. (However, your specific situation of 6 publications at the time of application + 2 submitted is definitely &quot;a lot to offer&quot; from your side, and on par with MSc applicants.)