This has been reported at https://tickets.metabrainz.org/browse/MBS-10169, as the result of some recent changes to the musicbrainz website. This also affects Picard. The musicbrainz developers will try and fix it as soon as possible, thanks for the report.
Hi, @zas just updated some caching options that changed two days ago. That may have fixed it, but this bug cannot be reproduced easily. Please report if this bug occur again here, thank you.
That has certainly changed Picard for me. Back to solid and reliable list of my four collections.
This had been easy to repeat for me. Each time I restarted Picard I would have a different set of collections listed. Usually one or more of mine, but at least once I got a different one selected.
Now every time Picard is back to 100% reliable only my four collections.
But that means I missed out on the chance of adding random stuff to SonicMix… could have been an interesting surprise for someone. LOLs
Sadly for you, that wouldn’t have worked anyway! (well, I really hope so, in any case! ) . But hey, if what you want is to add stuff to other people’s collections, then you’ll like MBS-9428 which is almost ready. You’ll just need to get their permission first (booooring).
@IvanDobsky: Thank you for confirming this bug is now fixed.
Note: Only public collections of other users could be seen, not private ones. It only affected the retrieval of collection list, it did not allow editing collections of any other user.
To sum up, no user private data leak, no privilege escalation, still good chances to not retrieve the correct collection list.
That may not be totally true, at least in my case.
When I first noticed this problem, the response from the API included a collection from a user who has no public collections. Granted, it didn’t show the releases in that collection but it did reveal that they had at least one private collection, along with its name, collection type and release count.
Just a quick note to add - thank you for being so quick on to this issue and fix. Normally when I see mention of a ticket it means a fix at an unknown future time. This quick response was very good to see.