Take for example the question (on Drupal.SE) about "How to process the results of a VBO enabled view via Rules?". It is deleted and in its Linked block (to the right, above its "Related" block) it shows 2 other questions. Users on that site with less than 10k reputation, or without a diamond, or not the author of the question (who happens to be me) only see a friendly "Page Not Found" message, which is all good.
However, by manually changing the URL to the Linked questions view of the question, any user can see it. Even with less than 10k reputation, even totally anonymous visitors. This is showing at least:
- the title of the deleted question.
- the title of the questions linked to the deleted question.
Why does Linked questions allow anyone to see some details of the deleted post without checking their privileges? That does not seem to be the case for these variations for that same question:
Note: for deleted questions with 0 linked questions (such as this example), a similar Linked questions URL also reveals the title of the deleted question.