CVE-2026-45780: Exposure of Sensitive Information to an Unauthorized Actor

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, EventSerializer could expose invited group names, sample invitees, and attendance statistics to users who could view the topic but were not entitled to view the private event invitee list. This...

CVE-2024-24817 User can see invitees in events created in PMs and private categories

Discourse Calendar adds the ability to create a dynamic calendar in the first post of a topic on the open-source discussion platform Discourse. Prior to version 0.4, event invitees created in topics in private categories or PMs private messages can be retrieved by anyone, even if they're not logg...