BIT-DISCOURSE-2026-45780 Discourse: Private event sample invitees are serialized to non-invited event viewers

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...

PT-2024-20583 · Discourse · Discourse Calendar

Name of the Vulnerable Software and Affected Versions: Discourse Calendar versions prior to 0.4 Description: The issue allows event invitees created in private categories or private messages to be retrieved by anyone, even if they are not logged in. This is a problem with the Discourse Calendar...