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CVE PROGRAM SOURCE RECORD2.3 Low

CVE-2026-28282

Discourse vulnerable to group membership addition permission bypass via discourse-policy plugin

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a security flaw in the discourse-policy plugin which allowed a user with policy creation permission to gain membership access to any private/restricted groups. Once membership to a private/restricted group has been obtained, the user will be able to read private topics that only the group has access to. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, review all policies for the use of `add-users-to-group` and temporarily remove the attribute from the policy. Alternatively, disable the discourse-policy plugin by disabling the `policy_enabled` site setting.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

discourse discourse

  • >= 2026.1.0-latest, < 2026.1.2affected
  • >= 2026.2.0-latest, < 2026.2.1affected
  • = 2026.3.0-latestaffected

References