CVE-2026-54742
Gravedad CVSS v4.0:
MEDIA
Tipo:
No Disponible / Otro tipo
Fecha de publicación:
19/08/2026
Última modificación:
19/08/2026
Descripción
*** Pendiente de traducción *** 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 against self.community(), the receive handlers in crates/apub/activities/src/community/collection_add.rs and crates/apub/activities/src/community/collection_remove.rs dereference self.object as an ApubPost and update featured_community without verifying that post.community_id equals community.id. A moderator can therefore target an unrelated post owned by another community, push it into featured feeds and listings, or undo another community's legitimate curation decision. This issue is fixed in versions 0.19.19 and 1.0.0-alpha.20.
Impacto
Puntuación base 4.0
5.10
Gravedad 4.0
MEDIA
Referencias a soluciones, herramientas e información
- https://github.com/LemmyNet/lemmy/commit/108d78c592cc88bac2b0bf52ca6631be54f6fb23
- https://github.com/LemmyNet/lemmy/commit/abe256243822526dcd4bca857f7c0adeb49944f5
- https://github.com/LemmyNet/lemmy/pull/6500
- https://github.com/LemmyNet/lemmy/pull/6501
- https://github.com/LemmyNet/lemmy/releases/tag/0.19.19
- https://github.com/LemmyNet/lemmy/releases/tag/1.0.0-alpha.20
- https://github.com/LemmyNet/lemmy/security/advisories/GHSA-gwfj-h8r7-792v
- https://join-lemmy.org/news/2026-06-09_-_Lemmy_Release_v0.19.19