If an oversighted contribution caused an AbuseFilter hit, the resulting log's examine function allows non-oversight access to the suppressed data.
Using https://en.wikipedia.org/wiki/Special:AbuseFilter/examine/1096397467 as an example:
- Logged in (non-oversight) users can view the old_wikitext/new_wikitext, and thus the oversighted material.
- Logged out users cannot view the old_wikitext/new_wikitext but can view the summary, which in this case was oversighted.
(originally reported to oversight-l)