hi,
You should differentiate the Opera browser from Opera Next browser.
for example, I've installed Opera Next and vulnerability scan keeps asking to update Opera, the browser wrong. So ask for something that does not exist.
the only way to remove the allert vulnerability is to wait for a new update of Opera Next, but as long as you release the message of vulnerability persists
Opera Next is based on chromium, I think it is different from Opera.
best regards