| Package | Affected versions | Patched versions |
|---|---|---|
| discourse | = 2026.5.0≥ 2026.1.0, < 2026.1.4≥ 2026.3.0, < 2026.3.1≥ 2026.4.0, < 2026.4.1< 2026.1.0 | 2026.1.42026.3.12026.4.12026.1.0 |
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, DetailedTagSerializer#tag_group_names returned every tag group a tag belonged to without filtering against the requesting user's visibility. With SiteSetting.tags_listed_by_group enabled, anonymous and unprivileged users hitting TagsController#info (which is exempt from requires_login) could read the names of tag groups restricted to specific user groups or non-visible categories. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.
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