Lemmy: `CollectionAdd::Featured` does not check the post is in the community
Lemmy is a link aggregator and forum for the fediverse. From 0.19.18 until 0.19.19 and 1.0.0-alpha.20, a community moderator can feature or unfeature posts in other communities through federated CollectionAdd and CollectionRemove activities using CollectionType::Featured. After verify_mod_action authorizes the actor ag…
Severity medium: primary CNA CVSS 5.1 v4.0 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-08-19T20:10:56.632Z. Updated 2026-08-20T20:01:19.950Z.